vty: enable show subscribers filtered by IMEI

In 89fda3024a0c9a422cc5e5033b016ce0ab6c1ff3 I added a
vty command to show a summary of filtered subscribers by imsi
or msisdn. In practice there is a also need to be able to
filter on IMEI.

The idea here is not to replace every operation that could be
done directly on the sql database in the vty, but this one
is useful.

Change-Id: Ic4a11d3ebcf8909c68e9f4617e94dc822491e008
diff --git a/src/hlr_vty_subscr.c b/src/hlr_vty_subscr.c
index ad16045..82e0043 100644
--- a/src/hlr_vty_subscr.c
+++ b/src/hlr_vty_subscr.c
@@ -256,7 +256,7 @@
 #define SUBSCRS_SHOW_HELP "Show all subscribers (with filter possibility)\n"
 
 #define SUBSCR_ID "(imsi|msisdn|id|imei) IDENT"
-#define SUBSCR_FILTER "(imsi|msisdn) FILTER"
+#define SUBSCR_FILTER "(imei|imsi|msisdn) FILTER"
 
 #define SUBSCR_ID_HELP \
 	"Identify subscriber by IMSI\n" \
@@ -307,7 +307,8 @@
       show_subscriber_filtered_cmd,
       "show subscribers " SUBSCR_FILTER,
       SHOW_STR SUBSCRS_SHOW_HELP
-      "Filter Subscribers by IMSI\n" "Filter Subscribers by MSISDN\n" "String to match in msisdn or imsi\n")
+      "Filter Subscribers by IMEI\n" "Filter Subscribers by IMSI\n" "Filter Subscribers by MSISDN\n"
+      "String to match in imei, imsi or msisdn\n")
 {
 	const char *filter_type = argv[0];
 	const char *filter = argv[1];