gitclone: fix option name for git-executable

The uninstall part was not working in webrunner environment where there
is not $PATH

slapos/recipe/gitclone.py

@@ -259,7 +259,7 @@ def uninstall(name, options):
   """
   force_keep = False
   if options.get('develop', 'no').lower() in ('1', 'yes', 'true'):
-    p = subprocess.Popen([options.get('git_command', 'git'), 'status', '--short'],
+    p = subprocess.Popen([options.get('git-executable', 'git'), 'status', '--short'],
                           cwd=options['location'],
                           stdout=subprocess.PIPE)
     if p.communicate()[0].strip():
@@ -267,7 +267,7 @@ def uninstall(name, options):
             "This folder will be left as is." % options['location']
       force_keep = True
 
-    p = subprocess.Popen([options.get('git_command', 'git'),
+    p = subprocess.Popen([options.get('git-executable', 'git'),
                             'log', '--branches', '--not', '--remotes'],
                           cwd=options['location'],
                           stdout=subprocess.PIPE)