errors: remove trailing "!" from some error messages for consistency
Some types of exceptions had a trailing "!" printed after the message
from the exception itself. I guess some of these errors seem a little
more severe (?), but it seems more likely that the inconsistency was
just an oversight.
Differential Revision: https://phab.mercurial-scm.org/D9378
$ hg init
$ touch a
$ unset HGUSER
$ echo "[ui]" >> .hg/hgrc
$ echo "username= foo" >> .hg/hgrc
$ echo " bar1" >> .hg/hgrc
$ hg ci -Am m
adding a
abort: username 'foo\nbar1' contains a newline
[255]
$ rm .hg/hgrc
$ HGUSER=`(echo foo; echo bar2)` hg ci -Am m
adding a
abort: username 'foo\nbar2' contains a newline
[255]
$ hg ci -Am m -u "`(echo foo; echo bar3)`"
adding a
transaction abort!
rollback completed
abort: username 'foo\nbar3' contains a newline
[255]