Added more ability to search history to vppctl shell
*Up and down keys give history
*Script now written in Python 2.7.6
*Contains all original functionality
*Added Python dependency for deb/rpms
Change-Id: I5088f7b018fce92b9b5411df0bffc34709810dec
Signed-off-by: Padraig Connolly <padraig.connolly@intel.com>