tests/test-merge3

tests: removed redundant "-u test" from test scripts

The tests are executed with a .hgrc file which adds "-u test" by
default.

#!/bin/sh

hg init
echo This is file a1 > a
hg add a
hg commit -m "commit #0" -d "1000000 0"
touch b
hg add b
rm b
hg commit -A -m"comment #1" -d "1000000 0"