reload service only if it running, if not - start

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>
check for running service when reload, if not - start it

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>
Make Systemd service use shell_out.
Check shell_out's error? when running status command.
Update spec for shell_out.
Update contribution information for https://github.com/opscode/chef/pull/1532
Add url scheme to proxy, if not present.
Merge pull request #1624 from opscode/mcquin/basic_client_proxy

Add url scheme to proxy, if not present.
Merge pull request #1581 from opscode/vtolstov-systemd

vtolstov: reload service only if it running, if not - start