Use latest version of conf.d/app-templates submodule.
Use latest version of conf.d/app-templates submodule.

Changes of conf.d/app-templates:
  > Fix: idem...
  > Fix: Debian things triggered even when use the SDK
  > Merge "Add pkg-config for deb packaging"
  > Fix: wrong variable expands at configure_file time
  > Comments and README update
  > Autobuild scripts directory execution proof
  > Use variable to handle autobuild target directory
  > Fix: Debian detection, only valid in native env
  > Move variable definition to the right place.
  > change path etc/config.cmake to conf.d/cmake/config.cmake

Signed-off-by: Sebastien Douheret <f9be12b3a1c94f57a8a5030c89d140f4463af596@iot.bzh>

iotbzh/helloworld-service,iotbzh/helloworld-service,iotbzh/helloworld-service