[PATCH] Allow bzr to run even if paramiko isn't installed

[John A Meinel]

Attached is a patch which just what the title says.
Basically, it just changes the sftp load cycle, so that if anyone
actually tries to use an sftp:// branch, it will throw a "you need
paramiko" otherwise it loads normally.

That way you get the right error message, but only when someone uses the
functionality. (Though maybe it should be a BzrCommandError so as to not
print the traceback, since it really would be considered a user request
that failed).

I realize there are more lines changed, but I converted the line endings
to unix. Normally I wouldn't, but I had to indent the entire file,
because there is no other way I know of to conditionally change the
import process (you can't "return" when you have decided things go bad).
Since most of the file changed anyway, I just changed a little bit more.

John
=:->
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