utils: Add osmo-gsm-tester_setcap_net_*.sh scripts

This scripts were already being used by osmo-gsm-tester for a while, but
were not avaialable in this repository. Let's put them here to easy find
them and have all this kind of helper scripts together with code using
it.

Change-Id: Ib88a1b7818155fc608cc6ff763300fbd0e03a07a
diff --git a/utils/osmo-gsm-tester_setcap_net_raw.sh b/utils/osmo-gsm-tester_setcap_net_raw.sh
new file mode 100755
index 0000000..1f3a727
--- /dev/null
+++ b/utils/osmo-gsm-tester_setcap_net_raw.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+/sbin/setcap cap_net_raw+ep "$1"