Use latest version of conf.d/templates submodule.

Use latest version of conf.d/templates submodule.

Changes of conf.d/templates:

(8d9b7f2 - Romain Forlot) Merge changes I81a6d9f6,I67698bbb
(b0a2632 - Romain Forlot) Fix: remove old bug about overwriten variables.
(5a83e47 - Romain Forlot) Update README
(abd65a3 - Sebastien Douheret) Fix gdb debugging and add widget install on target
(7315692 - Romain Forlot) Update README
(d8fcd75 - Romain Forlot) Merge "Update config.cmake.sample"
(4dba246 - Romain Forlot) Merge "Replace LIBRARIES by LDFLAGS for pkgconfig dep"
(21ae95d - Romain Forlot) Fix:WIDGET_ENTRY_POINT variable always overwritten
(4809e42 - Romain Forlot) renamed default submodules dir
(2bb223e - Romain Forlot) Fix wrong path to submodule files.
(259e135 - Romain Forlot) Format
(af3cc64 - Ronan Le Martret) Replace LIBRARIES by LDFLAGS for pkgconfig dep
(695291d - Ronan Le Martret) Update config.cmake.sample
(c1fd793 - Jan-Simon Moeller) Merge "Set default value for APP_TEMPLATES_DIR
                              and WIDGET_ENTRY_POINT"
(f3e177c - Stephane Desneux) gitignore: add vim swap files
(7e6516c - Stephane Desneux) fix typo: 'license', not 'licence' (french)

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