Convert read_file() to read_password_file().
Convert read_file() to read_password_file().

This removes a lot of inline duplicated code in the
deltacloud GAHP.

Signed-off-by: Chris Lalancette <60b62644009db6b194cc0445b64e9b27bb26433a@redhat.com>

clalancette/condor-dcloud,clalancette/condor-dcloud,clalancette/condor-dcloud,clalancette/condor-dcloud,clalancette/condor-dcloud,clalancette/condor-dcloud,clalancette/condor-dcloud