[py2py3] Syntax error when dropping MariaDB database

[amaltaro]

Impact of the bug
WMCore unit tests

Describe the bug
While commissioning the Python3 Jenkins CI, I noticed many unit tests failing with a syntax error when clearing the test SQL database, see [1].

How to reproduce it
Running this module unit tests:
WMCore_t/WMBS_t/JobSplitting_t/EventBased_t.py
with this option:

--reallyDeleteMyDatabaseAfterEveryTest=true

Expected behavior
Fix the SQL syntax such that we can run unit tests in BOT mode and cleaning up the database between tests.

Additional context and error message
[1]

======================================================================
ERROR: _test150EventMultipleFileSplit_
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/build/cmsbld/jenkins/workspace/DMWM-WMAgentPy3-TestAll/SLICE/2/label/cms-dmwm-cc7/code/test/python/WMCore_t/WMBS_t/JobSplitting_t/EventBased_t.py", line 43, in setUp
    self.testInit.setDatabaseConnection(destroyAllDatabase=True)
  File "/build/cmsbld/jenkins/workspace/DMWM-WMAgentPy3-TestAll/SLICE/2/label/cms-dmwm-cc7/code/src/python/WMQuality/TestInit.py", line 154, in setDatabaseConnection
    self.clearDatabase()
  File "/build/cmsbld/jenkins/workspace/DMWM-WMAgentPy3-TestAll/SLICE/2/label/cms-dmwm-cc7/code/src/python/WMQuality/TestInit.py", line 285, in clearDatabase
    self.init.clearDatabase()
  File "/build/cmsbld/jenkins/workspace/DMWM-WMAgentPy3-TestAll/SLICE/2/label/cms-dmwm-cc7/code/src/python/WMCore/WMInit.py", line 205, in clearDatabase
    raise WMInitException(msg)
WMCore.WMInit.WMInitException: <@========== WMException Start ==========@>
Exception Class: WMInitException
Message: Critical error while attempting to delete entire DB!
(MySQLdb._exceptions.ProgrammingError) (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'b'WMCore_unit_test'' at line 1")
[SQL: DROP DATABASE b'WMCore_unit_test']