Add oracle test

[karakayasemi]

Add oracle support on travis. #5

[DeepDiver1975]

This needs some more to be added - e.g. owncloud/oauth2#42

[DeepDiver1975]

@karakayasemi will you continue with this? THX

[karakayasemi]

Yes, I will when I make time for it. Thanks.

[codecov-io]

Codecov Report

Merging #15 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #15   +/-   ##
=========================================
  Coverage     70.56%   70.56%           
  Complexity       70       70           
=========================================
  Files            12       12           
  Lines           282      282           
=========================================
  Hits            199      199           
  Misses           83       83

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[karakayasemi]

Finally, all tests succeeded. There was a problem in before_install_oracle_module.sh. IMHO, the other repos which have tests for Oracle should apply the change to script for php7 and 7.1 with oracle env.
https://github.com/owncloud/security/blob/2a9c9cf08c0c4359362d57da94e05b23c19fa2cf/tests/.travis/before_install_oracle_module.sh#L12