Removing mod_ssl from package requirements for cobbler

Only cobbler-web requires this, and it's already there.
Fix validateks returning false on success.

Running:
/usr/bin/cobbler validateks && echo t || echo f

Returns:

*** all kickstarts seem to be ok ***
!!! TASK FAILED !!!
f

Which doesn't make much sense. This patch seems to correct the issue.
Merge branch 'master' into bugfixes
Merge pull request #499 from jimi1283/bugfixes

Bugfixes