Added handling of a 'local' option inside install.py which specifies
a local directory containing deb or rpm files to be installed.

Fixes: 5149
Signed-off-by: Warren Usui <warren.usui@inktank.com>
Merge pull request #160 from ceph/wip-fix-5149-wusui

Added handling of a 'local' option inside install.py which specifies