refs: MW-279

- At startup time global wsrep_on is set too late and some wsrep paths may be executed
  because of this. e.g. replication slave restart could happen before wsrep_on state is defined.
- This fix checks both global wsrep_on and wsrep_provider values to determine if wsrep
  processing should happen
- Fix affects all instances where WSREP_ON macro is used

sql/mysqld.cc

@@ -9205,7 +9205,7 @@ static int mysql_init_variables(void)
   strmake_buf(mysql_home, tmpenv);
 #endif
 #ifdef WITH_WSREP
-  if (WSREP_ON && wsrep_init_vars())
+  if (wsrep_init_vars())
     return 1;
 #endif
   return 0;

sql/wsrep_mysqld.h

@@ -200,8 +200,10 @@ extern void wsrep_prepend_PATH (const char* path);
 /* Other global variables */
 extern wsrep_seqno_t wsrep_locked_seqno;
 
-#define WSREP_ON \
-  (global_system_variables.wsrep_on)
+#define WSREP_ON                         \
+  ((global_system_variables.wsrep_on) && \
+   wsrep_provider                     && \
+   strcmp(wsrep_provider, WSREP_NONE))
 
 #define WSREP(thd) \
   (WSREP_ON && wsrep && (thd && thd->variables.wsrep_on))