Support socket name configuration in template form

For GuestQemuAgent Collector,
it provides the flexibility to configure
socket name in a template form.

Also, need to set raw flag to True
while fetching configs from ConfigParser
in order to be able to read the template.

Change-Id: Idf7d915f7bb3e5544625aa16205765e4099c6f57
Signed-off-by: Meghal Gosalia <meghal@yahoo-inc.com>
Reviewed-on: http://gerrit.ovirt.org/28608
Reviewed-by: Adam Litke <alitke@redhat.com>
Tested-by: Meghal .B. Gosalia <meghalgosalia@gmail.com>