gbproxy: Replace '.' in counter names with ':'

The '.' is illegal character in counter names, as they are exported
via CTRL interface, where '.' has a special meaning that cannot be
used by strings comprising the variable name.

Change-Id: I66a7e044c027672adf77fbd6c0a111c43ee31b4f
diff --git a/src/gprs/gb_proxy_peer.c b/src/gprs/gb_proxy_peer.c
index 8e28fc4..a862a83 100644
--- a/src/gprs/gb_proxy_peer.c
+++ b/src/gprs/gb_proxy_peer.c
@@ -40,13 +40,13 @@
 	{ "dropped",	   "BVC blocked, dropped packet     " },
 	{ "inv-nsei",	   "NSEI mismatch                   " },
 	{ "tx-err",	   "NS Transmission error           " },
-	{ "raid-mod.bss",  "RAID patched              (BSS )" },
-	{ "raid-mod.sgsn", "RAID patched              (SGSN)" },
-	{ "apn-mod.sgsn",  "APN patched                     " },
-	{ "tlli-mod.bss",  "TLLI patched              (BSS )" },
-	{ "tlli-mod.sgsn", "TLLI patched              (SGSN)" },
-	{ "ptmsi-mod.bss", "P-TMSI patched            (BSS )" },
-	{ "ptmsi-mod.sgsn","P-TMSI patched            (SGSN)" },
+	{ "raid-mod:bss",  "RAID patched              (BSS )" },
+	{ "raid-mod:sgsn", "RAID patched              (SGSN)" },
+	{ "apn-mod:sgsn",  "APN patched                     " },
+	{ "tlli-mod:bss",  "TLLI patched              (BSS )" },
+	{ "tlli-mod:sgsn", "TLLI patched              (SGSN)" },
+	{ "ptmsi-mod:bss", "P-TMSI patched            (BSS )" },
+	{ "ptmsi-mod:sgsn","P-TMSI patched            (SGSN)" },
 	{ "mod-crypt-err", "Patch error: encrypted          " },
 	{ "mod-err",	   "Patch error: other              " },
 	{ "attach-reqs",   "Attach Request count            " },