MB-25403: Remove ep_version statistic

Change-Id: I405906fcda605394e51a006849c55911d5a08284
Reviewed-on: http://review.couchbase.org/81649
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>

Author: Sriram Ganesan

src/cproxy_stats.c

@@ -17,7 +17,7 @@
 
 char *protocol_stats_keys_first =
     "pid version libevent "
-    "ep_version ep_dbname ep_storage_type ep_flusher_state ep_warmup_thread ";
+    "ep_dbname ep_storage_type ep_flusher_state ep_warmup_thread ";
 
 char *protocol_stats_keys_smallest =
     "uptime "