When not using swift with the redfish virtual media boot interface,
in other words local file storage, the file permissions for the
/httpboot/redfish folder was incorrect upon initially being created,
and new file ISOs were being created with permissions based upon the
conductor process umask value which is OS environment dependent.
Change-Id: I038ca335efa9b5443469ab8c8af12863deea0e38
(cherry picked from commit af6cd1093d)
(cherry picked from commit b1c8976d4b)