Adjust NodeDescriptor & fix hanging ZHA

[schiermi]

• NodeDescriptor is set to "Router" but it should reflect the requirement "Zigbee Coordinator API firmware".
• Issue raw_device_initialized after xbee_dev is available; otherwise https://github.com/zigpy/zigpy/blob/dev/zigpy/appdb.py#L385 is not satisfied leaving an uncommited INSERT hanging around which leads to blocking ZHA & malfunction after restart (missing device) in SQLite

[coveralls]

Pull Request Test Coverage Report for Build 322

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.0004%) to 99.721%

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Totals
Change from base Build 313:	-0.0004%
Covered Lines:	714
Relevant Lines:	716

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💛 - Coveralls