cosmetic: Add commandline option to display version

The -V option to display the Version and the copyright info
is missing.

Change-Id: I0c848fd42c13f473807caf3478d32c6ce5e43e31
diff --git a/openbsc/src/gprs/sgsn_main.c b/openbsc/src/gprs/sgsn_main.c
index 5cdfb31..04f2825 100644
--- a/openbsc/src/gprs/sgsn_main.c
+++ b/openbsc/src/gprs/sgsn_main.c
@@ -195,11 +195,12 @@
 			{"config-file", 1, 0, 'c'},
 			{"disable-color", 0, 0, 's'},
 			{"timestamp", 0, 0, 'T'},
+			{ "version", 0, 0, 'V' },
 			{"log-level", 1, 0, 'e'},
 			{NULL, 0, 0, 0}
 		};
 
-		c = getopt_long(argc, argv, "hd:Dc:sTe:",
+		c = getopt_long(argc, argv, "hd:Dc:sTVe:",
 				long_options, &option_index);
 		if (c == -1)
 			break;
@@ -224,6 +225,10 @@
 		case 'T':
 			log_set_print_timestamp(osmo_stderr_target, 1);
 			break;
+		case 'V':
+			print_version(1);
+			exit(0);
+			break;
 		case 'e':
 			log_set_log_level(osmo_stderr_target, atoi(optarg));
 			break;