fix bug to avoid setting ovs bandwidth rate limiting to 0
modify previous commit
add configuration for turning on/off network namespace for file transfer
add another example config file for bandwidth management
Merge remote branch 'upstream/network_namespaces' into network_namespaces
fix the dhcp lease cache bug - only store DHCP related classad attributes into cache
Merge pull request #15 from zhangzhehust/network_namespaces

bug fixes for Lark bandwidth management