test: remove aliases forcing date, use default-date

Now that we have the default-date by default and all code have been updated,
remove the old commands alias that forced the date as they are not longer
useful.

Writing tests now should be easier for everyone now that all dates should be
stable.

tests/run-tests.py

@@ -950,10 +950,6 b' class Test(unittest.TestCase):'
         hgrc.write(b'mergemarkers = detailed\n')
         hgrc.write(b'promptecho = True\n')
         hgrc.write(b'[defaults]\n')
-        hgrc.write(b'backout = -d "0 0"\n')
-        hgrc.write(b'commit = -d "0 0"\n')
-        hgrc.write(b'shelve = --date "0 0"\n')
-        hgrc.write(b'tag = -d "0 0"\n')
         hgrc.write(b'[devel]\n')
         hgrc.write(b'all-warnings = true\n')
         hgrc.write(b'default-date = 0 0\n')

tests/test-basic.t

@@ -1,10 +1,6 b''
 Create a repository:
 
   $ hg config
-  defaults.backout=-d "0 0"
-  defaults.commit=-d "0 0"
-  defaults.shelve=--date "0 0"
-  defaults.tag=-d "0 0"
   devel.all-warnings=true
   devel.default-date=0 0
   largefiles.usercache=$TESTTMP/.cache/largefiles (glob)

tests/test-commandserver.t

@@ -187,10 +187,6 b' check that local configs for the cached '
   ...     runcommand(server, ['-R', 'foo', 'showconfig', 'ui', 'defaults'])
   *** runcommand showconfig
   bundle.mainreporoot=$TESTTMP/repo
-  defaults.backout=-d "0 0"
-  defaults.commit=-d "0 0"
-  defaults.shelve=--date "0 0"
-  defaults.tag=-d "0 0"
   devel.all-warnings=true
   devel.default-date=0 0
   largefiles.usercache=$TESTTMP/.cache/largefiles
@@ -204,10 +200,6 b' check that local configs for the cached '
   web\.ipv6=(?:True|False) (re)
   *** runcommand init foo
   *** runcommand -R foo showconfig ui defaults
-  defaults.backout=-d "0 0"
-  defaults.commit=-d "0 0"
-  defaults.shelve=--date "0 0"
-  defaults.tag=-d "0 0"
   ui.slash=True
   ui.interactive=False
   ui.mergemarkers=detailed