Log Message:
py-ncclient: updated to 0.6.4

0.6.4:
Pin selectors2 to Python versions <= 3.4
Fix config examples to actually use the nc namespace
fix: correctly set port for paramiko when using ssh_config file
test: add test to check ProxyCommand uses correct port
Update commits for py3
Enhance Alcatel-Lucent -support
Juniper RPC: allow specifying format in CompareConfiguration
Parsing of NETCONF 1.1 frames no longer decodes each chunk of bytes...
Fix filter in create_subscription
Validate 'with-defaults' mode based on supported modes advertised in capability URI