net: don't run osmo-gbproxy by default

osmo-gbproxy is not part of any of the convenience make targets in
gen_makefile.py (cn, cn-bsc, usrp). When using the typical workflow of
building one of these convenience targets first, then attempting to run
the network, the osmo-gbproxy window just says command not found.

With the default config_2g3g, it is not needed when only using one BTS,
so add a new config variable GBPROXY_RUN_IN_OSMO_DEV=0 and use it in
run.sh.

Change-Id: Ib1349809997ea6062ec3c43df92abab9fbfad1ea
2 files changed