#19192: Give up on time.xmlrpc.com as an xmlrpc network test.

time.xmlrpc.com has come and gone over the years, and has been gone again for
a while.  The test did test one thing that the current xmlrpc tests don't: the
use of multiple levels of attribute names in the call.  So in addition to
removing the network test, we add a test in xmlrpc of dotted name access.

There should also be a test for when dotted name access is disallowed, but
that requires more extensive test harness refactoring, and in any case was not
tested by the network test we are deleting, since it is a server-side setting.

This is a slightly simplified version of a patch by Vajrasky Kok.
Fix expected checksum for new unicodedata (after full rebuild)
Issue #9548: Add a minimal "_bootlocale" module that is imported by the _io module instead of the full locale module.
Issue #19205: Don't import the 're' module in site and sysconfig module to
to speed up interpreter start.
Issue #19205 fix 406529adf156
I forgot to hit save.
Also test that the locale module isn't loaded during normal startup
Issue #19209: Remove import of copyreg from the os module to speed up
interpreter startup. stat_result and statvfs_result are now hard-coded to
reside in the os module.
The patch is based on Victor Stinner's patch.
test_os: report tests as skipped when os.statvfs() fails with ENOSYS
Issue #19209: fix structseq test
merge