[tracker] (16 commits) Non-fast-forward update to branch wip/carlosg/portal

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/portal' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  cd1d04a... examples: Add example flatpak definition
  4377ae1... portal: Handle */default keywords in policy
  2b350a9... portal: Set up watch on peers
  f119fcb... portal: Add DBus service file
  066c698... docs: Add xdg-tracker-portal manpage
  9d7c6a2... portal: Add CloseSession request
  e06b577... libtracker-bus: Explicitly close sandbox sessions on connec
  624d011... libtracker-data: Cache connections in SERVICES{} virtual ta
  44c68bd... portal: Add systemd user session unit file
  e630a3a... portal: Handle missing .flatpak-info file
  7f3035c... tests: Add tests for CONSTRAINT declarations in prologue
  3959b4c... portal: Handle default object path in lookups
  7fcb5d0... ci: Don't install systemd user services

Commits added to the branch:

  13519bc... examples: Add example flatpak definition
  d9042f3... portal: Handle */default keywords in policy
  9648475... portal: Set up watch on peers
  8fccb31... portal: Add DBus service file
  5a4f7c2... docs: Add xdg-tracker-portal manpage
  5f39c12... portal: Add CloseSession request
  36c4d9b... libtracker-bus: Explicitly close sandbox sessions on connec
  d043240... libtracker-data: Cache connections in SERVICES{} virtual ta
  447205e... portal: Add systemd user session unit file
  0330296... portal: Handle missing .flatpak-info file
  8d30536... tests: Add tests for CONSTRAINT declarations in prologue
  bb793ed... portal: Handle default object path in lookups
  8954298... ci: Don't install systemd user services
  fa31e7b... libtracker-data: Allow prefixed names in constraint rules
  f3d4586... portal: Allow prefixed names in graph constraints
  c0f05ff... tracker: Initialize variable