Local uri input monitor support

[AWSHurneyt]

Issue #, if available: 166

Description of changes:
This PR is inherited from #166.
Implementations are adapted from #166 for use with LocalUriInput.

Internal Changes

1. Refactored HttpInput to LocalUriInput to reflect that this feature only supports local clusters at this time. Only a path field has been exposed as host and port only support localhost and 9200 for now.
2. Modified several components to make the create monitor, edit monitor, and create trigger pages display properly for LocalUriInput type monitors.
3. Modified formikToMonitor.js to handle LocalUriInput type monitors.
4. Added LocalUriInput.test.js snapshot test.
5. Added snapshot tests for formikToInputs() and formikToLocalUri() in formikToMonitor.test.js.
6. Added can build LocalUriInput monitor test to monitorToFormik.test.js.

External Changes

1. Modified getOverviewStats to display Local URI definition type.
2. The Response block on the create monitor page will display the response contents for the API called using the provided path.
3. Modified CreateTrigger.js such that the Trigger Condition block on the create trigger page will display the first field name in the API response for LocalUriInput monitors (e.g., ctx.results[0].XXX != null).

UX Screenshots
Additional option in the 'define monitor' dropdown menu

The 'Create Monitor' page

The 'Create Trigger' page

The 'Monitor Overview' page

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[tlfeng]

Overall, look's good and clean. 👍