Update ks.pm

Fix missing whitespace after ```$cmd``` when using disablerepos.
Merge pull request #30 from stdweird/patch-1

aii ks: add additional separator when using disablerepos
add support for enable_service

enable_service kickstart parameter support, needed for example when booting from 10 GB Mellanox cards
add support for enable_service in ks.pm
Add a check if the list is not empty
Remove extra parenthesis from the check
Merge pull request #35 from dzila/aii-service

add support for enable_service
Merge pull request #1 from quattor/master

Update