Test Infrastructure Sprint

• drop the samba3/samba4 distinction?
• randomize test order [mat]
• statistics!
  • measure total run time and per test run time
  • prevent slow test addition
  • record env startup time [jelmer]
• make testsuite output top X [mat]
• reduce the cardinality of RPC tests
• parallelize with testr [jelmer]
  • migrate to subunit2
  • make all tests support --list
  • require all tests output subunit
  • reduce selftest run overhead
    • make symbol deduplication a test, not a build phase