tests/test-revert-flags.t

test-parse-date: defines explicit start/end dates for DST

Prior to this patch, DST times where tested by specifying a custom TZ
environment variable that didn't defined DST transition times.

Due to a bug in glibc, the test fail on 32bits platforms that use timezone
files generated by zic from tzcode >= 2014c (glibc >= 2.20).

See https://sourceware.org/bugzilla/show_bug.cgi?id=19738

By defining explicit transition times for DST in the TZ environment variable,
the test is now independant to how the system guess those transition times.

#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 ..