Fix and improve suite find info in run/restart stdout.

[hjoliver]

The pgrep command suggested for detecting running suites was broken. This fixes it, and makes it print full info for just the parent process (instead of just PID for parent and all sub-processes), and also suggests scan and ping commands that work from other hosts.

Example output:

ERROR: port file exists: /home/oliverh/.cylc/ports/foo

If foo is not running, delete the port file and try again.  If it is
running but not responsive, kill any left over suite processes too.

To see if foo is running on 'niwa-34403.niwa.local:7766':
 * cylc scan -n '\bfoo\b' niwa-34403.niwa.local
 * cylc ping -v --host=niwa-34403.niwa.local foo
 * ssh niwa-34403.niwa.local "pgrep -a -P 1 -fu $USER 'cylc-r.* \bfoo\b'"

'ERROR, port file exists: /home/oliverh/.cylc/ports/foo'

And for the suggested commands:

[oliverh@wrh-1 ~]$ cylc scan -n '\bfoo\b' niwa-34403.niwa.local
foo oliverh@niwa-34403.niwa.local:7766

[oliverh@wrh-1 ~]$ cylc ping -v --host=niwa-34403.niwa.local foo
Generated suite passphrase: /home/oliverh/.cylc/passphrases/oliverh@niwa-34403.niwa.local/foo/passphrase
Running on niwa-34403.niwa.local:7766

[oliverh@wrh-1 ~]$ ssh niwa-34403.niwa.local "pgrep -a -P 1 -fu $USER 'cylc-r.* \bfoo\b'"
25383 python /home/oliverh/cylc/cylc.git/bin/cylc-run foo
[oliverh@wrh-1 ~]$ 

@matthewrmshin - please review (one review is probably enough).

[matthewrmshin]

Extra white space here breaks the pep8 test.