bosh status --internal - show blobstore URI

Director adds GET /internal_info API to return Hash of internal information
within the Bosh.

Initially only returning blobstore URI & credentials.

When logged into a bosh director supporting the endpoint:

    $ bosh status --internal
    Config
                 /Users/drnic/.bosh_config

    Director
      Name       bosh
      URL        https://216.55.141.199:25555
      Version    1.5.0.pre.3 (release:d380ee49 bosh:d380ee49)
      User       drnic
      UUID       3eda8bd3-bca9-40ef-9df3-16c0b42cd6d6
      CPI        openstack
      dns        enabled (domain_name: bosh)
      compiled_package_cache disabled
      Blobstore  dav://director:director@127.0.0.1:25250

When logged in to a bosh director lacking the endpoint:

    $ bosh status --internal
    Config
                 /Users/drnic/.bosh_config

    Director
      Name       firstbosh
      URL        https://216.55.141.200:25555
      Version    1.5.0.pre.703 (release:a8e65cc1 bosh:a8e65cc1)
      User       drnic
      UUID       bae3dae9-6359-43ad-87d3-fcb520aa0ac0
      CPI        openstack
      dns        enabled (domain_name: microbosh)
      compiled_package_cache disabled
      Internal   n/a (not available for target bosh)

When not logged in to target bosh:

    $ bosh status --internal
    Config
                 /Users/drnic/.bosh_config

    Director
      Name       bosh
      URL        https://216.55.141.199:25555
      Version    1.5.0.pre.3 (release:d380ee49 bosh:d380ee49)
      User       not logged in
      UUID       3eda8bd3-bca9-40ef-9df3-16c0b42cd6d6
      CPI        openstack
      dns        enabled (domain_name: bosh)
      compiled_package_cache disabled
      Internal   requires authentication