use default config for swift primary storage test config

allow testsuite to complete

fix timeout, script cleanup, enable debug for now

use btrfs loopback device, requires privileged container and absolute path

throw exception when storage has problems

debug by echo ...

sleep more, more debug

Fixes #15037

that I noticed while looking at some code.

Try to connect to the OCI host via sqlplus to ensure that the connection is already running. Required by the new OCI configuration on CI.

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.