feat: remove TLS 1.3 GODEBUG flag from test script
feat: remove TLS 1.3 GODEBUG flag from test script

TCP router is only a Go wrapper around HAProxy (which is not in written
in GO) therefore the GODEBUG flag does nothing.

[#172188707](https://www.pivotaltracker.com/story/show/172188707)

Co-authored-by: Tim Downey <ac5faf2072a7e8487ec8b27348636434d5c3410d@vmware.com>
Co-authored-by: Alex Standke <d5b5c41212ed50aae0fa89dda95a6a18e21e524a@vmware.com>

cloudfoundry-incubator/cf-tcp-router,cloudfoundry-incubator/cf-tcp-router