Remove the sphinxcontrib from the import path

I swear I fixed this during the merge. Must have undone the change
somehow.
Update bootstrap script to latest stable
Update bootstrap script stable version
Merge pull request #13567 from s0undt3ch/hotfix/bootstrap-script

Update bootstrap script to latest stable
Clarified salt-cloud error reporting
Merge pull request #13569 from rallytime/cloud_error_msg

Clarified salt-cloud user error reporting