Prevent expirations and evictions while paused

Proposed fix to https://github.com/antirez/redis/issues/4027

src/expire.c

@@ -105,6 +105,10 @@ void activeExpireCycle(int type) {
     int dbs_per_call = CRON_DBS_PER_CALL;
     long long start = ustime(), timelimit;
 
+    /* We cannot expire keys while clients are paused as the dataset is
+     * supposed to be static. */
+    if (clientsArePaused()) return;
+
     if (type == ACTIVE_EXPIRE_CYCLE_FAST) {
         /* Don't start a fast cycle if the previous cycle did not exited
          * for time limt. Also don't repeat a fast cycle for the same period