As the CLI client is initialized with a specific Vault address, is makes
sense to use the pooled HTTP client here. This will prevent setting up
new TCP sessions for each API call that the client needs to make.

Fix two problems with entity alias updating

* Fix panic when storage value is nil

* Ensure the value is at least of expected length

* Format correction

* Address review feedback

* include babel polyfill in the build

* submit not sumbit

This will handle patterns of the form:
  `^plugins/catalog/(?P<type>auth|database|secret)/(?P<name>.+)$`

Fixes #5701

Simplifes a case of strings.Index with strings.Contains. Inspired by https://staticcheck.io/docs/gosimple#S1003

* change backends template so that the icon shows in a namespace

* icons for secret-list and method list in a namespace