Hashicorp vault acceptance tests

[chris-j-h]

Acceptance tests for the retrieval of keys from a Hashicorp Vault and the saving of generated keys in a Vault.

• .travis.yml updated to ensure vault installed on Travis environment
• Maven profile added so that Vault tests are not run by default. If profile is enabled then Vault must be installed on the machine.
• This tests the positive scenarios; additional tests should be written to test the numerous negative scenarios.

[codecov-io]

Codecov Report

Merging #587 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #587   +/-   ##
=========================================
  Coverage     99.42%   99.42%           
  Complexity     1650     1650           
=========================================
  Files           254      254           
  Lines          5040     5040           
  Branches        249      249           
=========================================
  Hits           5011     5011           
  Misses            5        5           
  Partials         24       24

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