Add test for running scripts with shebang.
Add test for running scripts with shebang.

[#113205459]

Signed-off-by: Alvaro Perez-Shirley <79f29b890b0238cfb202ad154c4598ac29519534@pivotal.io>

cloudfoundry-incubator/route-registrar,cloudfoundry-incubator/route-registrar