Filter out unix-socket from unrelated test cases

mysql-test/suite/plugins/r/auth_v0100.result

 install soname 'auth_0x0100';
-select plugin_name, plugin_type_version from information_schema.plugins where plugin_type='authentication' order by plugin_name;
+select plugin_name, plugin_type_version from information_schema.plugins where
+plugin_type='authentication' and plugin_library is not null order by plugin_name;
 plugin_name	plugin_type_version
 auth_0x0100	1.0
-mysql_native_password	2.0
-mysql_old_password	2.0
 create user tt identified via auth_0x0100;
 grant select on test.* to zzzzzzzzzzzzzzzz;
 connect(localhost,tt,,test,MASTER_MYPORT,MASTER_MYSOCK);

mysql-test/suite/plugins/t/auth_v0100.test

@@ -6,7 +6,8 @@ if (!$AUTH_0X0100_SO) {
 
 install soname 'auth_0x0100';
 
-select plugin_name, plugin_type_version from information_schema.plugins where plugin_type='authentication' order by plugin_name;
+select plugin_name, plugin_type_version from information_schema.plugins where
+plugin_type='authentication' and plugin_library is not null order by plugin_name;
 
 create user tt identified via auth_0x0100;
 grant select on test.* to zzzzzzzzzzzzzzzz;

mysql-test/t/mysqld--help.test

@@ -30,7 +30,7 @@ perl;
               thread-concurrency super-large-pages mutex-deadlock-detector
               connect null-audit aria oqgraph sphinx thread-handling
               test-sql-discovery rpl-semi-sync query-cache-info
-              query-response-time metadata-lock-info locales/;
+              query-response-time metadata-lock-info locales unix-socket/;
 
   # And substitute the content some environment variables with their
   # names: