Debugging scripts needs the environment variable XDEBUG_CONFIG to be
set, which initiates a connection to a listening debugger. But if that
env is set and one of the PHP setup steps occurs (e.g. occ install), the
debugging session is 'completed' and the debugger no longer listens
during the actual tests. This saves the XDEBUG_CONFIG env so it only
applies during the PHPUnit execution, so only the real tests trigger the
debugging.

* waits until the docker container is started
* export USEDOCKER=1 to run the docker version of postgres

* gets executed in autotest.sh and fails if some PHPDoc is missing
* doesn't check classes/methods that are marked as @deprecated
* iterates over all .php files in lib/public

Fixes https://github.com/owncloud/core/issues/16296

Ref http://www.shellcheck.net/about.html

Oracle 11 XE is now fired up in a docker image - looks like we get back Oracle Testing on pull requests

Configs correctly cleaned, even if phpunit fails or autotest interrupted

When hitting Ctrl+C to interrupt unit test running, the old
configuration was not restored properly.

This fix traps the signal to properly restore the configuration after an
interruption.

error: pathspec 'tests/data/lorem-copy.txt' did not match any file(s) known to git.
error: pathspec 'tests/data/testimage-copy.png' did not match any file(s) known to git.

This will prevent frustration and confusion when unit tests fail because
the wrong phpunit version was used

autotest.sh now checks for the validity of the db config name argument.
If the db config name is not known, it show syntax info.

This should save some time to people to understand how to use this
script. Before this fix, an invalid argument would return a big HTML
page in the output.

The script now checks for config.php existance and backs it up before
running the test, then restores it back at the end. This avoids the
situation where devs lose their manually edited config if they forgot to
back it up before running the unit tests.

The script now also checks for config.php permissions beforehand to
avoid displaying an annoying HTML page output in the console with an
error message.

enabling, because the test shows a green ball: https://ci.tmit.eu/job/ownCloud-Server(doctrine)-oci/33/console