Improve Warning Messages - Docker Rate Limits

Product Requirements

1. If a remote repository pointing Docker hub is existing (based on the URL validation) - print a warning message in the level of the platform warnings
2. If the remote returned 429 code - we will propagate it to the client and write an appropriate message in the log
3. If a remote repository pointing Docker Hub was created with no credentials - print the same message both to the log and the platform warning message

The Error Message

Please note, it is recommended to set a DockerHub account on your Docker remote repositories to work opposite Docker Hub. List of relevant repositories: repoA, repoB. For more information read here (https://www.jfrog.com/confluence/display/JFROG/Docker+Registry#DockerRegistry-RemoteDockerRepositories)"

Text printed after getting 429 error code

Docker remote repo 'docker-remote' reached the request rate limit set by Dockerhub. Please contact Artifactory admin.

^^^ docker-remote == example for a repoKey