Use send instead of instance_eval

Instance_eval is much more powerful (and dangerous). Don't use that if
not necessary, which is this case.
Whitespace
Do not log to /var/log/katello by default

Log by default to ./log not to /var/log/katello. Otherwise it
tries to write to /var/log/katello on developer's machine. It
is handled by a symlink (part of RPM)

    `/usr/share/katello/log -> /var/log/katello`

in deployment.
908026 - updating feed certs in pulp upon new manifest import
Merge pull request #2354 from jlsherrill/repo_update

[Do Not Merge] 908026 - updating feed certs in pulp upon new manifest import
wrong package name, didn't need the rubygems
Merge pull request #2347 from iNecas/tech-depts

Use send instead of instance_eval
Merge pull request #2350 from pitr-ch/quick/var-log

Do not log to /var/log/katello by default
Merge remote-tracking branch 'origin/master' into pull-req-ruby193-libselinux-ruby2

Conflicts:
	rel-eng/comps/comps-katello-server-rhel6.xml