FIilter datasets by findability on publishers page

[zelima]

Originally coming from here datopian/datahub.io#154

We need to filter page by findability. Eg I'm interested to see only private datasets of mine

Acceptance Criteria

• Able to type private and get datasets (maybe like GitHub search?)
• or alternatively dropdown

Tasks

• do analysis and decide on solution
• implement

Analysis

• We can refactor our search to include switch statement, so it catches the following cases:
  • published - and returns only published
  • private - and returns only private
  • unlisted - and returns only unlisted

Somewhere here https://github.com/datahq/frontend/blob/master/routes/index.js#L1021 we can check query param and add get datasets by findability
We can refactor metastore search https://github.com/datahq/metastore/blob/master/metastore/blueprint.py to search by findability

https://api.datahub.io/metastore/search?q=datahub.ownerid=${ownerid}&token=${jwt}&findability=private

• We can implement radio button with findability options, something to similar to http://imedproject.org/proposals-database/
  @anuveyatsu
  Wdyt?