Encryption app, check config

[schiessle]

It seems like many users have configuration issues on windows servers with respect to openSSL, see #3629. This pull request catches this error, disables the app again and ask the user to check his server configuration.

cc @karlitschek @DeepDiver1975 @FlorinPeter

[karlitschek]

👍

[ghost]

Test passed.
Refer to this link for build results: https://ci.owncloud.org/job/pull-request-analyser/299/

[ghost]

Test failed.
Refer to this link for build results: https://ci.owncloud.org/job/pull-request-analyser/303/

[ghost]

Test passed.
Refer to this link for build results: https://ci.owncloud.org/job/pull-request-analyser/304/

[ghost]

Test passed.
Refer to this link for build results: https://ci.owncloud.org/job/pull-request-analyser/307/

[VicDeo]

👍 Successfully failed for me with the log entry

Error Encryption library Missing requirements. Please make sure that PHP 5.3.3 or newer is installed and that OpenSSL together with the PHP extension is enabled and configured properly. For now, the encryption app has been disabled.

openSSL is not configured so I can't test another case.

[VicDeo]

@schiesbn is it in master already?

[schiessle]

backported to master: 0deae7b...b39d2d1