add template-configs, script to launch network

This is the set of scripts I've written for myself over the years to easily
configure and run Osmocom core networks on my lab computer. I hope this will be
useful to others as well.
diff --git a/net/tmpl_std/osmo-gbproxy.cfg b/net/tmpl_std/osmo-gbproxy.cfg
new file mode 100644
index 0000000..3bc075d
--- /dev/null
+++ b/net/tmpl_std/osmo-gbproxy.cfg
@@ -0,0 +1,21 @@
+gbproxy
+ sgsn nsei 101
+ns
+ nse 101 nsvci 101
+ nse 101 remote-role sgsn
+ nse 101 encapsulation udp
+ nse 101 remote-ip ${SGSN_IP}
+ nse 101 remote-port ${SGSN_GB_PORT}
+ timer tns-block 3
+ timer tns-block-retries 3
+ timer tns-reset 3
+ timer tns-reset-retries 3
+ timer tns-test 30
+ timer tns-alive 3
+ timer tns-alive-retries 10
+ encapsulation framerelay-gre enabled 0
+ encapsulation framerelay-gre local-ip ${GBPROXY_IP}
+ encapsulation udp local-ip ${GBPROXY_IP}
+ encapsulation udp local-port ${GBPROXY_GB_PORT}
+
+${include(../common_logging)}