rename muranodashboard/tests to muranodashboard/test

Currently, the muranodashboard.test module cannot
be found, because the directory is named tests
instead of test.

Change-Id: I12a848ea964ca09300da5382882b50f0eea39830
Closes-Bug: #1303869
Merge "rename muranodashboard/tests to muranodashboard/test"