[MERGE] LockDir.lock_write() shouldn't require an email address

[John Arbash Meinel]

The attached patch fixes a small bug in LockDir.

Basically, it requires a semi-valid email address to be configured, or
'.lock_write()' will fail.

Also, extract_email_address() shouldn't be raising a generic BzrError.
So this patch updates it to raise a better exception, and then has the
callers catch the right exception.

Because of inheritance, we don't need to do a deprecation phase, because
NoEmailInUsername is a child of BzrError.

John
=:->

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