MB-5184 Append date, time and PID to crash dump name.

This makes names more or less unique.

Change-Id: I3c06c9e086806e0816b53b5eda3ef9ac6a292ef0
Reviewed-on: http://review.couchbase.org/21274
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>

couchbase-server.sh.in

@@ -35,6 +35,9 @@ couch_start_arguments=""
 LD_LIBRARY_PATH="@PREFIX@/lib":"@PREFIX@/lib/memcached":$LD_LIBRARY_PATH
 export LD_LIBRARY_PATH
 
+ERL_CRASH_DUMP=erl_crash.dump.$(date +%m-%d-%Y-%H:%M:%S).$$
+export ERL_CRASH_DUMP
+
 # For some obscure reason erl requires HOME environment variable to be set.
 if [ -z "$HOME" ]
 then