Cleanup monitor running state

server/modules/monitor/clustrixmon/clustrixmonitor.cc

@@ -208,7 +208,7 @@ bool ClustrixMonitor::configure(const MXS_CONFIG_PARAMETER* pParams)
 
 void ClustrixMonitor::populate_services()
 {
-    mxb_assert(state() == MONITOR_STATE_STOPPED);
+    mxb_assert(!is_running());
 
     // The servers that the Clustrix monitor has been configured with are
     // only used for bootstrapping and services will not be populated

server/modules/monitor/mariadbmon/mariadbmon.cc

@@ -695,7 +695,7 @@ bool MariaDBMonitor::check_sql_files()
 bool MariaDBMonitor::execute_manual_command(std::function<void(void)> command, json_t** error_out)
 {
     bool rval = false;
-    if (state() != MONITOR_STATE_RUNNING)
+    if (!is_running())
     {
         PRINT_MXS_JSON_ERROR(error_out, "The monitor is not running, cannot execute manual command.");
     }