tests: make test-shelve.t timing-independent
It was sometimes taking 2s for me (not the "1s" the test expected).
--- a/tests/test-shelve.t Wed Mar 08 22:12:49 2017 +0900
+++ b/tests/test-shelve.t Wed Mar 08 14:29:25 2017 -0800
@@ -1692,7 +1692,7 @@
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo 3 >> file && hg ci -Am 13
$ hg shelve --list
- default (1s ago) changes to: 1
+ default (*s ago) changes to: 1 (glob)
$ hg unshelve --keep
unshelving change 'default'
rebasing shelved changes