BTS_Tests: default value for mp_ipa_up_timeout too low

The default value for the module parameter mp_ipa_up_timeout is set to
10 sec. Given that the sysmobts needs around 10-11 sec. to perform one
restart cycle this is to low and causes tests to fail occasionally. Lets
increase the default value to 15 sec to get reliable.

Change-Id: I5bb290d00a02a25672305688352a03f3bf484ff3
Related: OS#3863
1 file changed