Hotfix 81 oaisim 2

this branch fixes a few issues mainly with the oaisim testcases 
 - improved gain control for oaisim
 - updated testcase list options for oaisim
 - XFORMS now command line options for oaisim and unitary sims
 - build script improvements for sudo; HW=None and XFORMS=1 now default
 - fixed SNR calculation in abstraction mode

See merge request !15

Conflicts:
	cmake_targets/autotests/test_case_list.xml

fixed mbmssim compilation issue
one more fix for build script sudo usage

Conflicts:
	cmake_targets/build_oai
	openair1/PHY/LTE_TRANSPORT/initial_sync.c
	openair1/SCHED/phy_procedures_lte_ue.c

in openair2/ENB_APP/enb_config.c
it was tested against 63, it should be tested against 15
no impact on processing whatsoever so no need to test