[PATCH] Allow to skip the feature tests

Hi Dave/Team,

It is not possible to run the regression testsuite on a machine, where
chromium driver is not installed with the current implementation, because -
we initialize the selenium webdriver on startup without checking whether it
is needed, or not.

I have attached the patch to take care of the issue.
It skips the webdriver initialization, and other related parameters, if
'feature_tests' is explicitly added in the exclude package list.

This will allow us to run the regression-suite using the following command
without the need of installing the chromedriver on the host machine.
i.e.
*python runtests.py --exclude feature_tests*

--

Thanks & Regards,

Ashesh Vashi
EnterpriseDB INDIA: Enterprise PostgreSQL Company
<http://www.enterprisedb.com>

*http://www.linkedin.com/in/asheshvashi*
<http://www.linkedin.com/in/asheshvashi>