py3: replace file() with open() in test-import-eol.t
file() is not present in Python 3.
This patch also adds b'' prefixes to make sure we write bytes in Python 3.
Differential Revision: https://phab.mercurial-scm.org/D2125
#require execbit
$ hg init repo
$ cd repo
$ echo foo > foo
$ chmod 644 foo
$ hg ci -qAm '644'
$ chmod 755 foo
$ hg ci -qAm '755'
reverting to rev 0
$ hg revert -a -r 0
reverting foo
$ hg st
M foo
$ hg diff --git
diff --git a/foo b/foo
old mode 100755
new mode 100644
$ cd ..