Add result of configuration of ivi-shell to AC_MSG_RESULT

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
Improvement of weston.ini.man. Add key:shell and remove tablet-shell

Add key:shell to CORE SECTION and move a example of desktop-shell from key:modules to key:shell.
Add cms-colord.so to key:modules of CORE SECTION.

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>