network: bridge_stp value not always correct

Update network_state to store the bridge_stp value as a boolean.
The various renderers then can map the boolean value to the correct
output as needed; eni uses 'on/off', sysconfig uses 'yes/no' and
netplan will use the boolean directly.

Update unittest values for sysconfig and netplan.  Both contained the
network_state string value which resulted in not correctly enable/disable
STP in the target system.

Update network_state comment (fd -> forward-delay, add stp as boolean) on
bridge commands to match the expected format of a netplan bridge command.

LP: #1721157

0 files changed, 0 insertions, 0 deletions