Apply logging of arguments to modules (issue #122)

The ohai and facter modules use /usr/bin/logger to log the fact that
they have been invoked.  I added 'import os' to the ping module
so that it could have the same syslog statements as the other modules.
I separated the condensed:
    shlex.split(open(argfile, 'r').read())
into two separate statements similar to the other modules.

library/git

@@ -31,6 +31,7 @@ import os
 import sys
 import shlex
 import subprocess
+import syslog
 
 # ===========================================
 # Basic support methods
@@ -57,6 +58,8 @@ if not os.path.exists(argfile):
 
 args = open(argfile, 'r').read()
 items = shlex.split(args)
+syslog.openlog('ansible-%s' % os.path.basename(__file__))
+syslog.syslog(syslog.LOG_NOTICE, 'Invoked with %s' % args)
 
 if not len(items):
    fail_json(msg="the command module requires arguments (-a)")