Allow username in package name

[hrathod-twitch]

#585

Don't fail if a vanity service returns
a package name with a SSH url and a
username, such as ssh://git@example.com/org/package.

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Message from Katie Hockman:

Patch Set 2: Commit message was updated.

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Message from Katie Hockman:

Patch Set 3: Commit message was updated.

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Message from Katie Hockman:

Patch Set 4:

Please update the format of the commit message to meet the contribution guidelines (https://golang.org/doc/contribute.html#commit_messages).

I am adding the wait-issue hashtag until a decision has been made on the linked issue.

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