Allow custom TestProp3DFollower timeout

Use the approach from commit 1de7c32b (Allow custom
TestTM3DLightComponents timeout, 2014-04-07) for this test too.

Change-Id: I798744b825db38eebc6e5c9f55df6c0d76050e64
Merge topic 'custom-TestProp3DFollower-timeout' into master

ba0984b9 Allow custom TestProp3DFollower timeout