Fix Travis environment config

Apparently having two environment variables on separate lines means:
"test each environment separately". Combine them into one line.

Change-Id: I4ddb69e0b4c42bd58060351850c89eb8531158e3
Reviewed-on: http://gerrit.causes.com/35628
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>