Don't put .src.rpm files in RPMS

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
planex-install should ignore src rpms

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Merge pull request #19 from simonjbeaumont/dont-copy-srpms

Source RPMs shouldn't form part of the build output