Allow to change default startup timeout when starting containers in TS

Current setup for arquillian doesn't set startupTimeoutInSeconds property and as such it uses default 60s timeout for every container started during testsuite execution.

This is fine most of the time but when executing accross many platforms and JDK combinations in CI on heavily used machines it happens from time to time this timeout is not enough. It would be convinient to have the ability to set the timeout to the higher value form the command line.