usage in sync with reality.

docker containers should be stopped before being removed - refs https://github.com/docker/docker/issues/18758

moved set -e after executable checking with which as old position off set -e stopped the script at this point without any error message

The usage of single quotes make sure that a string is used verbatim in
bash. And no variables are subsituted.

Introduce evaluation of an environment variable to choose if all, only database or only database unit tests are to be executed.
This is mainly required on automated execution on Jenkins

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