[7.0.2] Basic auth does not trigger login hook

[PVince81]

Steps to reproduce:

1. Put a breakpoint in apps/files_encryption/hooks/hooks.php in the function login
2. Run curl -D - http://user:password@localhost/owncloud/
3. Run curl -D - http://user:password@localhost/owncloud/remote.php/webdav

Expected result

Both curl calls return a session cookie and both run the login hook.

Actual result

Basic auth on the root at step 2. does NOT call the login hook.
Result: if that session is used to upload files, encryption is disabled and files are not encrypted.
I'd expect the encryption library to throw an exception instead of just not encrypting files. CC @schiesbn (`shouldEncrypt() simply returns false when encryption was not initialized)

Note: this doesn't happen with the known WebDAV clients (sync client, dolphin, cadaver, etc) because they all authenticate directly against "remote.php/webdav".
But ownCloud aware libraries might do it like pyocclient and authenticate on the root, because the library might be used for OCS as well as for WebDAV.

I'll fix pyocclient for now to use the Webdav endpoint in the mean time.

Versions

ownCloud 7.0.2
Apache 2.4

@LukasReschke @DeepDiver1975 @schiesbn

[LukasReschke]

Let me take this.