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

net/config_2g3g

@@ -79,6 +79,7 @@ SGSN_GB_PORT=23000
 
 GBPROXY_IP="${TO_RAN_IP}"
 GBPROXY_GB_PORT=7777
+GBPROXY_RUN_IN_OSMO_DEV=0
 
 PCU_GB_LOCAL_PORT=23000
 

net/templates/run.sh

@@ -238,7 +238,11 @@ fi
 
 term "$hlr" HLR
 term "$sgsn" SGSN
-term "$gbproxy" GBPROXY
+
+if [ "${GBPROXY_RUN_IN_OSMO_DEV}" = 1 ]; then
+  term "$gbproxy" GBPROXY
+fi
+
 term "$mgw4msc" MGW4MSC
 term "$msc" MSC
 term "$hnbgw" HNBGW