TpTestsContactsConnection: sync with telepathy-glib 0.99.10
Telepathy test utilities: sync with telepathy-glib next-gvariant1 branch

Cosmetic changes only.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=77139
Sync TpTestsSimple* from telepathy-glib gdbus-properties2 branch

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=77144