install-openmano.sh change to install osm-im, lib-osm-openvim in pure python2...

install-openmano.sh change to install osm-im, lib-osm-openvim in pure python2 without calling make that imposes many unneeded packages

Change-Id: I3149a1b7656a2adb5b1a4ffbb973e49a6a00d0e0
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>