Make logging to journal match what goes to syslog on non-systemd hosts

Added SunOS (Solaris, illumos, etc) service management 

attempt to add service to chkconfig when suggested

Added additional filter options for instances for EC2 and Eucalyptus

fixed doc regarding wild card pattern on groups.

rhn_channel module

Support systemd template service unit files

Add quotes around postgresql database name

disabled appending file with garbage when regexp didn't match.

Fix pathnames in comments

Limit scope of arguments to service_control() in service module

Changed python interpreter to be consistent in these modules as compared...

Fix broken virtualenv link in pip documentation.

Add links to the ansible-examples repository in docs

Fixes for get_remote_head in git module

See issue #2471

This fixes get_remote_head() to be smarter about how to check remote
head.  It checks if it is a remote branch or tag and then checks for the
remote object id associated with it.  If it is sha1, get_remote_head()
returns it as-is since there doesn't appear to be a way to check a
remote repository for a specific object/sha1.  is_remote_tag() is added
to help out the new functionalit in get_remote_head().

In main(), if check_mode is true and version is a sha1, the module now
checks to see if the object is present.

This fixes handling of arguments (module argument) in service_control().
It is now locally scoped such that modifications to it, in the case of a
systemd host, do not later impact subsequent calls to service_control().
See issue #2449.

Without patch:
ansible-service[6177]: Command /usr/bin/systemctl stop cups cups , daemonize True

With patch:
ansible-service[6475]: Command /usr/bin/systemctl start cups , daemonize True

I also updated the comments to reflect the case where systemd is really
being called.

This makes the log message the same, whether it is sent to systemd's
journal or to syslog.  It retains the extra fields that are passed to
journal, such as MOUDLE=<name> and additional arguments.  Since journal
will reflect messages to syslog, this keeps what goes to syslog
informative instead of the terse 'Ansible module invoked'.

See issue #2461.

invalidate group cache when adding a new group

invalidate group cache so that a group added by the add_host module will be relfected in the groups variable in later plays.