ovs-bugtool: Separate capability for general network info.

ovs-bugtool: Separate capability for general network info.

Current situation is that CAP_NETWORK_STATUS has a max size of 50 MB.
When we have around 100,000 openflow flows, we over-run that size
by just running the "ovs-ofctl dump-flows" command. All the openvswitch
commands run through the plugin scripts in this repo won't have its
data stored in the debug bundle in this case as they are part of
CAP_NETWORK_STATUS too. One option to correct this is to increase
the CAP_NETWORK_STATUS max size to a higher number. But CAP_NETWORK_STATUS
also includes a bunch of general network related information collected
by running commands like ethtool, tc etc. and we probably want to limit
the data collected through those commands.

With this commit, we create a new capability called CAP_NETWORK_INFO
and collect general network related information through them. For OVS
related information, we continue to use CAP_NETWORK_STATUS, but remove
the maximum size restriction. One rationale to keep OVS related
information in CAP_NETWORK_STATUS is because xen-bugtool probably expects
OVS information in that capability.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>