Update slapos.core version

stack/slapos.cfg

@@ -135,7 +135,7 @@ pytz = 2016.10
 requests = 2.13.0
 six = 1.11.0
 slapos.cookbook = 1.0.92
-slapos.core = 1.4.22
+slapos.core = 1.4.23
 slapos.extension.strip = 0.4
 slapos.extension.shared = 1.0
 slapos.libnetworkcache = 0.16
@@ -150,7 +150,7 @@ xml-marshaller = 0.9.7
 paramiko = 2.1.3
 
 # Required by:
-# slapos.core==1.4.22
+# slapos.core==1.4.23
 Flask = 0.12
 
 # Required by:
@@ -222,7 +222,7 @@ jsonschema = 3.0.0a3
 lockfile = 0.12.2
 
 # Required by:
-# slapos.core==1.4.22
+# slapos.core==1.4.23
 # XXX 'slapos node format' raises an exception with netifaces 0.10.5.
 netifaces = 0.10.4
 
@@ -255,7 +255,7 @@ python-dateutil = 2.7.3
 rpdb = 0.1.5
 
 # Required by:
-# slapos.core==1.4.22
+# slapos.core==1.4.23
 supervisor = 3.3.3
 
 # Required by:
@@ -263,11 +263,11 @@ supervisor = 3.3.3
 tzlocal = 1.5.1
 
 # Required by:
-# slapos.core==1.4.22
+# slapos.core==1.4.23
 uritemplate = 3.0.0
 
 # Required by:
-# slapos.core==1.4.22
+# slapos.core==1.4.23
 zope.interface = 4.3.3
 
 [networkcache]