Load kvm.modules only if it exists

Change-Id: I57519de196e80b09af1f6a459ef3be9b47413eca
Fixes: rhbz#979041
Fixes install on CentOS 6.4

/bin/test doesn't exist on CentOS 6.4 (minimal install at least)

/usr/bin/test exists on Fedora, CentOS, RHEL, etc

Change-Id: Ie709bfb592c64c2a637370b9a12c4493a34f3640
Removing needless slash from 2 usage strings

Also correcting a typo ('s/activtion/activation/').

Change-Id: I878fdde5612c4e91eb609290fefd51946d215ac8
Update documentation grammar.

Change-Id: I042863c14b7d842575a49510b66b1af2e3ec7a20
Merge "Load kvm.modules only if it exists" into grizzly
Merge "Fixes install on CentOS 6.4" into grizzly
Merge "Removing needless slash from 2 usage strings" into grizzly
Merge "Update documentation grammar." into grizzly