MFH: r393672

• upgrade to 1.7.21
• fix py-subversion (convert BDB_CONFIGURE_OFF back to !${PORT_OPTIONS:MBDB})
• fix sample apache module config ('s/dav_module/dav_svn_module/')
• add tuning example for dav_svn_module

MFH: r395129

• update to 1.7.22

Developer-visible changes:

• General:
  • fix the regression test suite which was broken in 1.7.21 (r1694012)

Approved by: ports-secteam (delphij@)