examples/schema.py: show whether a leaf is config in verbose mode
add examples/bigtap-interface-errors.py

This program displays all interfaces which have nonzero error counters and the
values of those counters.
examples/bigtap-interface-errors.py: show switch alias instead of dpid
translate '_' to '-' in Node.match
add examples/bigtap-tshark.py

This program captures all traffic on a given filter port and displays it using
tshark in realtime.
examples/bigtap-tshark.py: add tcp-syn rule option
examples/bigtap-tshark.py: put tshark in a new session

This prevents SIGINT from being sent to tshark when ctrl-c is pressed. We want
tshark to die only after we close stdin.
examples/bigtap-tshark.py: use try/finally blocks to cleanup tshark and policy
examples/bigtap-tshark.py: add support for wireshark
support disabling SSL cert verification
add examples/viewdebugcounters.py

This program displays the debug counters from all switches in realtime.
examples/viewdebugcounters.py: add optional filter arguments
update examples to use attribute access exclusively

__getattr__ and _values may be going away.
Merge remote-tracking branch 'pybcf/master'

Conflicts:
	examples/schema.py