exmdb_client: switch remote_id back to using PID instead of startuptime

When multiple services (midb, zcore) are started at the same time on the same
machine, time(nullptr) yields the same value, which means they receive
notifications they did not necessarily ask for.

Fixes: gromox-1.16-78-gd099a2d04
Fixes: gromox-1.16-198-gfdd4c84e3

Author: jengelh

lib/exmdb_client.cpp

@@ -65,7 +65,7 @@ void exmdb_client_init(unsigned int conn_max, unsigned int threads_max)
 	mdcl_notify_stop = true;
 	mdcl_conn_max = conn_max;
 	mdcl_threads_max = threads_max;
-	snprintf(mdcl_remote_id, arsizeof(mdcl_remote_id), "%llx.", static_cast<unsigned long long>(time(nullptr)));
+	snprintf(mdcl_remote_id, arsizeof(mdcl_remote_id), "%u.", static_cast<unsigned int>(getpid()));
 	auto z = strlen(mdcl_remote_id);
 	guid_machine_id().to_str(mdcl_remote_id + z, arsizeof(mdcl_remote_id) - z, 32);
 	fprintf(stderr, "[exmdb_client]: identity has been set to \"%s\"\n", mdcl_remote_id);