slapos/cli: Improve output printing

Before this commit, some slapos commands would output this warning:
```
  No handlers could be found for logger "cachecontrol.controller"
```

The affected commands included:
- slapos service list
- slapos service info
- slapos computer list
- slapos computer info
- slapos computer token
- slapos cache source

slapos/cli/cache_source.py

@@ -38,7 +38,7 @@ import prettytable
 
 from slapos.grid import networkcache
 from slapos.cli.config import ConfigCommand
-from slapos.cli.list import resetLogger
+from slapos.cli.command import resetLogger
 from slapos.util import str2bytes
 
 class CacheLookupCommand(ConfigCommand):

slapos/cli/command.py

@@ -29,12 +29,18 @@
 
 import argparse
 import functools
+import logging
 import os
 import sys
 
 from cliff import command
 
 
+def resetLogger(logger):
+    logger.propagate = False
+    logger.addHandler(logging.StreamHandler(sys.stdout))
+
+
 class Command(command.Command):
 
     def get_parser(self, prog_name):

slapos/cli/computer_info.py

@@ -27,23 +27,15 @@
 #
 ##############################################################################
 
-import logging
 import pprint
 import sys
 
+from slapos.cli.command import resetLogger
 from slapos.cli.config import ClientConfigCommand
 from slapos.client import init, ClientConfig
 from slapos.slap import ResourceNotReady, NotFoundError
 
 
-def resetLogger(logger):
-    """Remove all formatters, log files, etc."""
-    if not getattr(logger, 'parent', None):
-      return
-    handler = logger.parent.handlers[0]
-    logger.parent.removeHandler(handler)
-    logger.addHandler(logging.StreamHandler(sys.stdout))
-
 class InfoCommand(ClientConfigCommand):
     """get information of an computer"""
 

slapos/cli/computer_list.py

@@ -27,20 +27,13 @@
 #
 ##############################################################################
 
-import logging
 import sys
 import six
 
+from slapos.cli.command import resetLogger
 from slapos.cli.config import ClientConfigCommand
 from slapos.client import init, ClientConfig
 
-def resetLogger(logger):
-    """Remove all formatters, log files, etc."""
-    if not getattr(logger, 'parent', None):
-      return
-    handler = logger.parent.handlers[0]
-    logger.parent.removeHandler(handler)
-    logger.addHandler(logging.StreamHandler(sys.stdout))
 
 class ListCommand(ClientConfigCommand):
     """request an instance and get status and parameters of instance"""

slapos/cli/computer_token.py

@@ -27,23 +27,15 @@
 #
 ##############################################################################
 
-import logging
 import pprint
 import sys
 
+from slapos.cli.command import resetLogger
 from slapos.cli.config import ClientConfigCommand
 from slapos.client import init, ClientConfig
 from slapos.slap import ResourceNotReady, NotFoundError
 
 
-def resetLogger(logger):
-    """Remove all formatters, log files, etc."""
-    if not getattr(logger, 'parent', None):
-      return
-    handler = logger.parent.handlers[0]
-    logger.parent.removeHandler(handler)
-    logger.addHandler(logging.StreamHandler(sys.stdout))
-
 class TokenCommand(ClientConfigCommand):
     """get token for setup a computer"""
 

slapos/cli/info.py

@@ -27,23 +27,15 @@
 #
 ##############################################################################
 
-import logging
 import pprint
 import sys
 
+from slapos.cli.command import resetLogger
 from slapos.cli.config import ClientConfigCommand
 from slapos.client import init, ClientConfig
 from slapos.slap import ResourceNotReady, NotFoundError
 
 
-def resetLogger(logger):
-    """Remove all formatters, log files, etc."""
-    if not getattr(logger, 'parent', None):
-      return
-    handler = logger.parent.handlers[0]
-    logger.parent.removeHandler(handler)
-    logger.addHandler(logging.StreamHandler(sys.stdout))
-
 class InfoCommand(ClientConfigCommand):
     """get status, software_release and parameters of an instance"""
 

slapos/cli/list.py

@@ -27,20 +27,13 @@
 #
 ##############################################################################
 
-import logging
 import sys
 import six
 
+from slapos.cli.command import resetLogger
 from slapos.cli.config import ClientConfigCommand
 from slapos.client import init, ClientConfig
 
-def resetLogger(logger):
-    """Remove all formatters, log files, etc."""
-    if not getattr(logger, 'parent', None):
-      return
-    handler = logger.parent.handlers[0]
-    logger.parent.removeHandler(handler)
-    logger.addHandler(logging.StreamHandler(sys.stdout))
 
 class ListCommand(ClientConfigCommand):
     """request an instance and get status and parameters of instance"""

slapos/slap/hateoas.py

@@ -420,7 +420,7 @@ class SlapHateoasNavigator(HateoasNavigator):
     assert len(hosting_subscription_list) <= 1, \
       "There are more them one Hosting Subscription for this reference"
 
-    hosting_subscription_jio_key= None
+    hosting_subscription_jio_key = None
     for hosting_subscription_candidate in hosting_subscription_list:
       if hosting_subscription_candidate.get('title') == reference:
         hosting_subscription_jio_key = hosting_subscription_candidate['relative_url']