Tests failing on TravisCI

[mbarto]

There are 4 tests that are failing (too) often on TravisCI:

• OpenlayersMap "after each" hook for "check layers init" FAILED: timeout of 2000ms exceeded. Ensure the done() callback is being called in this test.

• layers Epics refreshes layers with error FAILED: Error: Expected 1 to be 2 (tests-travis.webpack.js line 3798 > eval:29)
  .

• search Epics produces the search epic FAILED: Error: Expected 2 to be 4 (tests-travis.webpack.js line 3798 > eval:29)

• search Epics geometry service FAILED: Error: Expected 2 to be 5 (tests-travis.webpack.js line 3798 > eval:29)