Don't hardcode port used for the WatirSpec server.
Don't hardcode port used for the WatirSpec server.

This is useful if a CI machine wants to the suite concurrently.

abotalov/watir-webdriver,jkotests/watir-webdriver,titusfortner/watir,abotalov/watir-webdriver,abotalov/watir-webdriver,watir/watir,watir/watir,titusfortner/watir,jkotests/watir,watir/watir,titusfortner/watir-webdriver,jkotests/watir-webdriver,titusfortner/watir,jkotests/watir,titusfortner/watir-webdriver,abotalov/watir-webdriver,jkotests/watir,titusfortner/watir,jkotests/watir,watir/watir