Add ctags tags directory to .gitignore.
Add ctags tags directory to .gitignore.

Change-Id: Ibcbf175bed28c6761792bb1e557be9816598ba6c
Signed-off-by: Brandon Baker <a57ed95460e44c7b5dd675b778bcd98e47bd07ea@intel.com>

cmcantalupo/geopm,cmcantalupo/geopm,geopm/geopm,cmcantalupo/geopm,geopm/geopm,cmcantalupo/geopm,cmcantalupo/geopm,geopm/geopm,geopm/geopm,geopm/geopm