Git message issue fetch fixed and improvements

Master branch was not able to fetch Issue: 1 if it is not on title.
This commit will allow to find it from description, based on
regex defined in Jenkins GUI.

Also improved output to Mantis. On master it is like:
"
Integrated in commit_log_to_mantis_note_test:4 ( See
<sensured path to Jenkins job> [^] ).

Revision/Changeset: 37c1d872f19b993fa31af8d787a7446708d4deda
Author: masoom.ahmad
Log:
Issue : 33905
Changed paths:
 test_file.txt
"

In my branch it is like:
"
Git commit SHA: 5ecf7deb34bcd1151775fac2f65238300f3caa62
Author: vesa.valkonen

Test commit title

Test commit description

Issue: 60
Change-Id: I7732810265239255fafa0171653effad7f71e53d

Changed paths:
M README
  + 1 other files changed.
"

On Jenkins GUI you are able to change the max amount of printed files.
Here the limit is 1, and commit contains 2 files.
GUI have also option to add some string before SHA, if you want
to link it to Gerrit gitweb or similar.