dbus-ptest: fix populate_sdk error

 When we enable "ptest", populate_sdk fails with the following error:
 # bitbake core-image-minimal -c populate_sdk
 ..
 Collected errors:
  * satisfy_dependencies_for: Cannot satisfy the following dependencies
    for dbus-ptest-dev:
  *    dbus-ptest (= 1.6.10-r0) *
  * opkg_install_cmd: Cannot install package dbus-ptest-dev.

Disable that dependency.

Signed-off-by: Maxin B. John <maxin.john@enea.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
avahi: use correct names in SYSTEMD_SERVICE_* variables

Don't hard-code full package names in SYSTEMD_SERVICE_*, because in multilib
they'll be changed.

[ YOCTO #4803 ]

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>