Enhancement 64 phy test

this branch (re)-introduces functionality that allows to run the eNB as a signal generator and the UE as a vector signal analyzer (old OPENAIR2=0). 
Tests mostly pass (as good as before).

See merge request !18

Conflicts:
	openair1/SCHED/phy_procedures_lte_ue.c
	targets/SIMU/USER/oaisim_functions.c

Merge branch 'enhancement-64-phy_test' of https://gitlab.eurecom.fr/oai/openairinterface5g into enhancement-64-phy_test

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:
	openair1/SCHED/phy_procedures_lte_ue.c
	targets/RT/USER/lte-softmodem.c

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