RE-1164 Remove Travis CI file
RE-1164 Remove Travis CI file

With the switch to using rpc-gating standard jobs, this file is no
longer required because Travis CI is not used.

cfarquhar/rpc-maas,briancurtin/rpc-maas,npawelek/rpc-maas,npawelek/rpc-maas,cloudnull/rpc-maas,cfarquhar/rpc-maas,briancurtin/rpc-maas,cloudnull/rpc-maas,cloudnull/rpc-maas,cfarquhar/rpc-maas,briancurtin/rpc-maas,npawelek/rpc-maas