Remove two unused config options in baremetal

baremetal.injected_password and injected_network_template are not used
anywhere, so just remove them.

The actual injection config options used, such as net_config_template,
are in baremetal.pxe.

Change-Id: I93b4d2c2303a1ce954c45fc7e9842b18615bd56f
Merge "Remove two unused config options in baremetal"