df-server test mocking

[randypitcherii]

df-server now supports end-to-end auth, so more advanced spring test setup is needed to support unit testing.

Do the following:

• mock the spring security context with username/password in the StoreImpl test suite.
• create a MockValve that implements IValve with very very basic behavior for unit testing
• remove any hardcoded URL's in df-server tests that rely on the Hashmapinc-hosted drilltest server.

[randypitcherii]

NOTE: be sure to use mockito to mock/stub valve behaviors. Don't actually implement a new class, ya dummy

[niaalex]

We are not mocking the valve. StoreImpl This is a child of the new EPIC TBD.