Allows the hash server credentials to be specified in bitbake variables.
If omitted, the users .netrc will be checked
(From OE-Core rev: ba391d39f2b888706e53028e9df3a37c5baedfc1)
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>