registry host with trailing forward slash on registry add cannot be queried or removed

[nurmi]

There is a bug that is preventing proper internal encoding/formatting of registry host strings if they are added to the system with a trailing forward slash. The behavior can be reproduced like so:

# anchore-cli registry add badregistry/ foo bar --skip-validate
Registry: badregistry/
User: foo
Type: docker_v2
Verify TLS: True
Created: 2019-05-30T16:13:34Z
Updated: 2019-05-30T16:13:34Z


# anchore-cli registry list
Registry            Type             User          
badregistry/        docker_v2        foo           

# anchore-cli registry get badregistry/
Error: registry not found in DB
HTTP Code: 404
Detail: {'error_codes': []}

The fix will involve investigation of which component is not handling the trailing slash correctly as well as a review of the url encode/decode points between the client, api service and catalog service.