Remove _check_remote_connectivity in scenario.manager

_check_remote_connectivity is used only once, and
check_remote_connectivity doesn't contain so many lines,
so the logic of _check_remote_connectivity can be put
directly inside check_remote_connectivity, so to reduce
the number of helpers in scenario.manager and to make
code simpler and more readable.

Change-Id: I20ceb92a91026cb257656cde12f8772e45821d5e
1 file changed