[Registry] fallbackRegistryUrl configuration parameter

[jankowiakmaria]

What's this about?

This PR introduces new registry configuration parameter fallbackRegistryUrl. It allows developers to set another registry as a fallback in addition to their local one, so that they can focus on developing their single component within larger system.

wiki update (following pages should be updated with additional parameter information)

Registry -> configuration

|<sub>fallbackRegistryUrl</sub>|string (url)|no|Url to another registry which will be used by current registry when component cannot be found in current registry|

Cli -> Commands -> dev

usage update:

oc dev <dirName> [port] [baseUrl] [--hotReloading=value [--fallbackRegistryUrl=value]]

parameters (table) update:

|fallbackRegistryUrl|Url to another registry which will be used by dev registry when component cannot be found in local registry. Example: --fallbackRegistryUrl=http://anotherhost:anotherport/||

[matteofigus]

Excellent @pbazydlo and @jankowiakmaria - I just updated the wiki and published a new version.