Revert "don't reuse servers in test_server_actions"

This reverts commit b7f648b31c9044e3a7c25c0fb1dcc31a81e0da9f.

Change-Id: I31672c8b131fec4a916c4d703f6819c22d605876
Related-Bug: #1298472
Merge "Revert "don't reuse servers in test_server_actions""