[litevirt] Don't drop gamin

Package contains /usr/lib64/libfam.*, which are required to start
service lighttpd but not as requires in lighttpd rpm spec.

So, just keep gamin for litevirt lighttpd.
[litevirt] Add lighttpd to litevirt and have it enabled by default
[litevirt] Don't drop gamin (continued)

There are 2 droprpm for gamin, and the previous commit only removes
one of them.
[litevirt] Initalize certificate rpm and add it to litevirt

Initialize ssl certificates and package them in ovirt-node-certificate.rpm.

Any secure connections on litevirt are supposed to use them.