Revert "add os distro for travis"
Revert "add os distro for travis"

This reverts commit 08ca532a0b625eee854af08f23f37940df8ba8db.

viraintel/OWASP-Nettacker,viraintel/OWASP-Nettacker,viraintel/OWASP-Nettacker,viraintel/OWASP-Nettacker