docker / machine / 4185

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Pull #2464

travis-ci

Fixes issue #2310 - machine ls --filter with engine label

* Added a new members `Labels` to `FilterOptions struct`, and `EngineOptions` to
`HostListItem struct`. `HostListItems` is already being read from the file
store `config.json` which TestFilterHostsReturnSetLabel engine labels.

* Modified `parseFilters()` and added new `func matchesLabel(`) which compares
the one or more label values provided as input.

* Also the changes include added tests for UT and integration.
Note: Have kept `--filter label=<key>=<value>` syntax which is similar to
`docker images --filter` to keep the usability consistent.

review comments from @dgageot

Signed-off-by: Anil Belur <askb23@gmail.com>

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