Add --disable-discovery argument to physical network

Adds support for a '--disable-discovery' argument to the 'kayobe
physical network configure' command. This can be used to configure the
physical network after discovery of bare metal compute nodes is
complete, to return the network to a normal state. The interface
configuration to be applied is configured via
'switch_interface_config_disable_discovery'.

Essentially, this is the mirror of the '--enable-discovery' argument.

Change-Id: I40426a8fd22e51e8ea3350013a614dfbcf2afccf
Story: 2004048
Task: 27054