RDB fuzz test cases

Former-commit-id: 6df4d294220ed914c592f3bd195ae921d6a84cde

fuzz/rdb/dict.txt

@@ -0,0 +1,13 @@
+="repl-stream-db"
+="repl-id"
+="repl-offset"
+="lua"
+="redis-ver"
+="ctime"
+="used-mem"
+="aof-preamble"
+="redis-bits"
+="mvcc-tstamp"
+="keydb-subexpire-key"
+="keydb-subexpire-when"
+

src/server.cpp

@@ -5243,6 +5243,10 @@ int main(int argc, char **argv) {
     aeReleaseLock();    //Finally we can dump the lock
     moduleReleaseGIL(true);
 
+    // If we're just fuzzing then we've already loaded the RDB so just quit successfully
+    if (strstr(argv[0],"keydb-fuzz-rdb") != NULL)
+        return EXIT_SUCCESS;
+
     serverAssert(cserver.cthreads > 0 && cserver.cthreads <= MAX_EVENT_LOOPS);
     pthread_t rgthread[MAX_EVENT_LOOPS];
     for (int iel = 0; iel < cserver.cthreads; ++iel)