Galera_3nodes test suite does not suppress Warnings.

While running individual tests of Galera_3nodes , We get warnings like

╰$ ./mtr galera_3nodes.galera_parallel_apply_3nodes
Logging: /home/xyz/Work/server/mysql-test/mysql-test-run.pl galera_3nodes.galera_parallel_apply_3nodes
vardir: /home/xyz/Work/build/mysql-test/var
Checking leftover processes...
Removing old var directory...
Creating var directory '/home/xyz/Work/build/mysql-test/var'...
Checking supported features...
MariaDB Version 10.1.20-MariaDB-debug

• SSL connections supported
• binaries are debug compiled
  Collecting tests...
  Installing system database...

==============================================================================

TEST RESULT TIME (ms) or COMMENT
--------------------------------------------------------------------------

worker[1] Using MTR_BUILD_THREAD 300, with reserved ports 16000..16019
galera_3nodes.galera_parallel_apply_3nodes 'innodb_plugin' [ fail ] Found warnings/errors in server log file!
Test ended at 2016-12-03 20:16:47
line
2016-12-03 20:16:37 139917359640832 [Warning] WSREP: Could not open state file for reading: '/home/xyz/Work/build/mysql-test/var/mysqld.1/data//grastate.dat'
2016-12-03 20:16:37 139917359640832 [Warning] WSREP: access file(/home/xyz/Work/build/mysql-test/var/mysqld.1/data//gvwstate.dat) failed(No such file or directory)
2016-12-03 20:16:38 139917124429568 [Warning] WSREP: Member 2.0 (anom) requested state transfer from 'any', but it is impossible to select State Transfer donor: Resource temporarily unavailable
2016-12-03 20:16:39 139917124429568 [Warning] WSREP: Member 2.0 (anom) requested state transfer from 'any', but it is impossible to select State Transfer donor: Resource temporarily unavailable
^ Found warnings in /home/xyz/Work/build/mysql-test/var/log/mysqld.1.err
ok
line
2016-12-03 20:16:37 139774031245568 [Warning] WSREP: Could not open state file for reading: '/home/xyz/Work/build/mysql-test/var/mysqld.3/data//grastate.dat'
2016-12-03 20:16:37 139774031245568 [Warning] WSREP: access file(/home/xyz/Work/build/mysql-test/var/mysqld.3/data//gvwstate.dat) failed(No such file or directory)
2016-12-03 20:16:38 139773796673280 [Warning] WSREP: Member 2.0 (anom) requested state transfer from 'any', but it is impossible to select State Transfer donor: Resource temporarily unavailable
2016-12-03 20:16:39 139773796673280 [Warning] WSREP: Member 2.0 (anom) requested state transfer from 'any', but it is impossible to select State Transfer donor: Resource temporarily unavailable
^ Found warnings in /home/xyz/Work/build/mysql-test/var/log/mysqld.3.err
ok
line
2016-12-03 20:16:37 140069236740352 [Warning] WSREP: Could not open state file for reading: '/home/xyz/Work/build/mysql-test/var/mysqld.2/data//grastate.dat'
2016-12-03 20:16:37 140069236740352 [Warning] WSREP: access file(/home/xyz/Work/build/mysql-test/var/mysqld.2/data//gvwstate.dat) failed(No such file or directory)
2016-12-03 20:16:38 140069002274560 [Warning] WSREP: Member 2.0 (anom) requested state transfer from 'any', but it is impossible to select State Transfer donor: Resource temporarily unavailable
2016-12-03 20:16:39 140069002274560 [Warning] WSREP: Member 2.0 (anom) requested state transfer from 'any', but it is impossible to select State Transfer donor: Resource temporarily unavailable
^ Found warnings in /home/xyz/Work/build/mysql-test/var/log/mysqld.2.err
ok

• saving '/home/xyz/Work/build/mysql-test/var/log/galera_3nodes.galera_parallel_apply_3nodes-innodb_plugin/' to '/home/xyz/Work/build/mysql-test/var/log/galera_3nodes.galera_parallel_apply_3nodes-innodb_plugin/'

Only 1 of 2 completed.
--------------------------------------------------------------------------
The servers were restarted 0 times
Spent 0.000 of 17 seconds executing testcases
mysql-test-run: WARNING: Got errors/warnings while running tests, please examine '/home/xyz/Work/build/mysql-test/var/log/warnings' for details.

Failure: Failed 1/1 tests, 0.00% were successful.

Failing test(s): galera_3nodes.galera_parallel_apply_3nodes

The log files in var/log may give you some hint of what went wrong.

If you want to report this error, please read first the documentation
at http://dev.mysql.com/doc/mysql/en/mysql-test-suite.html