Using `sudo FWUPD_PROFILE=10 ./src/fwupd --verbose` will print a
dump of startup times onto the console so that we can debug which
plugin is slowing down system startup. For example:
../src/fu-engine.c:5409:plugins-coldplug [108.55ms]:
../plugins/amt/fu-plugin-amt.c:437:amt [27.14ms]:
:create-context [12.66ms]
:get-version [8.44ms]
:add-device [3.95ms]
This adds support for optionally using a UNIX domain socket where a
D-Bus daemon may not be running.
To use this, launch the daemon and clients with something like
`FWUPD_DBUS_SOCKET=/var/run/fwupd.sock fwupdmgr get-devices`
