OVSDriver: replace ind_ovs_port->config with a bitfield

The config bits are dependent on the OpenFlow wire version. Translating them to
a bitfield makes the internals version-independent.
OVSDriver: add version parameter to ind_ovs_key_to_match

The packet-in message will be formatted according to
indigo_cxn_get_async_version(), so the match should be too.
OVSDriver: use packet-in version to install suppression flows
ivs: always configure connections as OpenFlow 1.3

This just sets the maximum OpenFlow version we advertise.
ivs: remove ind_ovs_version

The only global configuration related to the OpenFlow version is the forwarding
pipeline. Everything else is done per-connection.

This change uses the --openflow-version command line option just as a fallback
(and backwards compatibility) for the --pipeline option.
ivs: document --pipeline option
Merge into master from pull request #97:
Get rid of ind_ovs_version (https://github.com/floodlight/ivs/pull/97)