More enhancemnet to the scripts.

Deleted repo_n_signing.sh as it is splited in
to two scripts i.e. repo_creation.sh pkg_signing.sh

Signed-off-by: Lalatendu Mohanty <lmohanty@redhat.com>
Merge pull request #4 from LalatenduMohanty/master

repo_signing has to be done as 'root'