Disable coverage report for "tls" fork

- We are not running most of the automated tests, so
  coverage is very low and skews the overall report

.travis.yml

@@ -24,7 +24,6 @@ script:
 - go test -v -covermode=count -coverprofile=common.coverprofile ./common
 - go test -v -covermode=count -coverprofile=osl.coverprofile ./common/osl
 - go test -v -covermode=count -coverprofile=protocol.coverprofile ./common/protocol
-- go test -v -covermode=count -coverprofile=tls.coverprofile -run TestObfuscatedSessionTicket ./common/tls
 # TODO: fix and reenable test, which is failing in TravisCI environment:
 # --- FAIL: TestTunneledTCPIPv4
 #    tun_test.go:226: startTestTCPClient failed: syscall.Connect failed: connection timed out