add password support for redis connects in cache and session

AMOS BEGIN
 MOV [unoconvwarning,fileconverter_unoconv],[unoconvwarning,admin]
AMOS END

Merge branch 'MDL-58023_behat_find_node_in_navigation_improvement_master' of https://github.com/gthomas2/moodle

In unit test, we write cache file often and
opcache might fail to detect changes. It will
be nice to invalidate opcode cache to ensure
we have the correct file_exists status

Oring should not be done with old status,
as it will always return failure.