Modified gitignore to ignore json file
Modified gitignore to ignore json file

Signed-off-by: Fermin Ordaz <a119d26a2df8d897e236264b5f49339a5039ee4c@gmail.com>

cloudfoundry-incubator/cf-tcp-router-acceptance-tests,cloudfoundry-incubator/cf-tcp-router-acceptance-tests,davidwadden/cf-tcp-router-acceptance-tests,davidwadden/cf-tcp-router-acceptance-tests