python: Add generic Key-Value parser.

Most of ofproto and dpif flows are based on key-value pairs. These
key-value pairs can be represented in several ways, eg: key:value,
key=value, key(value).

Add the following classes that allow parsing of key-value strings:
* KeyValue: holds a key-value pair
* KeyMetadata: holds some metadata associated with a KeyValue such as
  the original key and value strings and their position in the global
  string
* KVParser: is able to parse a string and extract it's key-value pairs
  as KeyValue instances. Before creating the KeyValue instance it tries
  to decode the value via the KVDecoders
* KVDecoders holds a number of decoders that KVParser can use to decode
  key-value pairs. It accepts a dictionary of keys and callables to
  allow users to specify what decoder (i.e: callable) to use for each
  key

Also, flake8 seems to be incorrectly reporting an error (E203) in:
"slice[index + offset : index + offset]" which is PEP8 compliant. So,
ignore this error.

Acked-by: Terry Wilson <twilson@redhat.com>
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

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