Move test user configuration from test file to hiera

The test user configuration is currently hardcoded in the file
that kicks off the test.  Moving the test user configuration to
the hiera file so we can easily change/control it.

Change-Id: I2b0ca39df2e3b270d0c7213cccdd527ade0cfdb8
Closes-Bug: 1339902
Merge "Move test user configuration from test file to hiera"