If terminalPrivate namespace is not available, make crosh print warning and exit
If terminalPrivate namespace is not available, make crosh print warning and exit

BUG=None
TEST=manual

Change-Id: I811a304fe1235be1cfe86bbf4da1c93c49643028
Reviewed-on: https://gerrit.chromium.org/gerrit/16110
Reviewed-by: Robert Ginda <4419ac4e35d191308e944202d542b192188656d1@chromium.org>
Commit-Ready: Toni Barzic <f679c7fc1851c0786edcf4cb72893c06a872b4b5@chromium.org>
Tested-by: Toni Barzic <f679c7fc1851c0786edcf4cb72893c06a872b4b5@chromium.org>

hernad/libapps,hernad/libapps,hernad/libapps,hernad/libapps