Implement --noaggregate command line and config option

Implement --noaggregate command line and config option

After adding arm targets to Tizen:IVI and Tizen:Common it
became impossible for repa to create groups as every submission
contains mic-bootstrap and qemu aggregated packages. Repa doesn't
allow to group submissions if they contain the same packages.

This is quite ugly solution. repa group should be refactored
to allow proper implementation.

With this line in config:
   noaggregate = mic-bootstrap-x86-arm.rpm|mic-bootstrap.rpm|\
                 mic-bootstrap-debugsource.rpm|qemu-accel-armv7l.rpm|\
                 qemu-accel-armv7l-cross-arm.rpm|qemu-linux-user-cross-arm.rpm
it should be possible to create groups again.

Fixes: #1990
Change-Id: I4d13a95e6947634df87eead2821efbd943d85822
Signed-off-by: Ed Bartosh <eduard.bartosh@intel.com>