Make test-hardlinks-safety repeatable and executable

tests/test-hardlinks-safety

@@ -9,6 +9,8 hg init a
 cd a
 
 hg qimport -n foo - << EOF
+# HG changeset patch
+# Date 1 0
 diff -r 2588a8b53d66 a
 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
 +++ b/a	Wed Jul 23 15:54:29 2008 +0200
@@ -23,6 +25,8 cp -al a b
 cd b
 
 hg qimport -n bar - << EOF
+# HG changeset patch
+# Date 2 0
 diff -r 2588a8b53d66 a
 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
 +++ b/b	Wed Jul 23 15:54:29 2008 +0200

tests/test-hardlinks-safety.out

@@ -5,22 +5,22 Now at: foo
 adding bar to series file
 applying bar
 Now at: bar
-9373c9d7b61ff62edc4685b85115a54aa92cd6fa:foo
-6dd08b80614ae7ed7f9224fb089e90deb999ae76:bar
+430ed4828a74fa4047bc816a25500f7472ab4bfe:foo
+4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c:bar
 %
 foo
 bar
 %%%
-9373c9d7b61ff62edc4685b85115a54aa92cd6fa:foo
+430ed4828a74fa4047bc816a25500f7472ab4bfe:foo
 %
 foo
 %%%
-6dd08b80614ae7ed7f9224fb089e90deb999ae76 foo
-9373c9d7b61ff62edc4685b85115a54aa92cd6fa bar
+4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c foo
+430ed4828a74fa4047bc816a25500f7472ab4bfe bar
 %
-6dd08b80614ae7ed7f9224fb089e90deb999ae76 lfoo
-9373c9d7b61ff62edc4685b85115a54aa92cd6fa lbar
+4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c lfoo
+430ed4828a74fa4047bc816a25500f7472ab4bfe lbar
 %%%
-6dd08b80614ae7ed7f9224fb089e90deb999ae76 foo
+4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c foo
 %
-6dd08b80614ae7ed7f9224fb089e90deb999ae76 lfoo
+4e7abb4840c46a910f6d7b4d3c3fc7e5209e684c lfoo