[PATCH v2] git-send-mail: ask smtp password several times

Hi,

Here the second version of my patch.

With this patch we are able to enter more than one time the password for the
smtp server. Before this patch we had only one trial.

I'm a newbie in perl. Please have attention to newbie failures for perl.

To me it was not possible to implement a test for my changes. Has someone
suggestion to this?

v2:
	* rebase to master-branch (0ecd94d7d728)
	* fix some perl-styles

v1:
	* first version. patch was based on next branch

Cheers,
	Silvio