Fix the Pan code in ncm-network.

The import script failed to set the correct headers and some versions
were hardcoded by mistake.
Use append for register_change.

It's more friendly not to override any configs the user might already
have there.
Correct schema for ssh LogLevel

The schema for ssh LogLevel was following standard SYSLOG levels rather than
the correct ssh options, correct this from the schema as used at RAL.
Merge pull request #36 from piojo/network-fixes

Fix the Pan code in ncm-network.
Merge pull request #44 from jrha/master

Correct LogLevel validation in ncm-ssh schema