Changes

Remove unused options from installer
This change removes options -b <REFSPEC>, -m <MODULE>, --source,
--develop, --pullimages, --nodockerbuild from full_install_osm.sh and 
install_osm.sh
It also remove unused unctions such as generate_docker_images and 
cmp_overwrite.
Change-Id: I0c307a765671c4af8516afa97808b70baadb964f Signed-off-by:
garciadeblas <gerardo.garciadeblas@telefonica.com>