Fix private urls using colon separator

Closes #573, closes #2416.

Related to #2384, #573.

src/resolvers/exotics/git-resolver.js

@@ -11,6 +11,7 @@ import ExoticResolver from './exotic-resolver.js';
 import Git from '../../util/git.js';
 
 const urlParse = require('url').parse;
+const urlFormat = require('url').format;
 
 // we purposefully omit https and http as those are only valid if they end in the .git extension
 const GIT_PROTOCOLS = ['git:', 'git+ssh:', 'git+https:', 'ssh:'];
@@ -92,7 +93,9 @@ export default class GitResolver extends ExoticResolver {
     }
 
     const {config} = this;
-    const client = new Git(config, url, this.hash);
+
+    parts.pathname = parts.pathname.replace(/^\/:/, '/');
+    const client = new Git(config, urlFormat(parts), this.hash);
     const commit = await client.init();
 
     async function tryRegistry(registry): Promise<?Manifest> {