alljoyn-base: new package

alljoyn-base: new package

AllJoyn Base Services are common services used by many devices,
providing a set of interfaces for different devices to interact and
interoperate with one another.

https://allseenalliance.org

Signed-off-by: Fabrice Fontaine <fabrice.fontaine@orange.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
[Thomas:
 - Add dependency on BR2_TOOLCHAIN_HAS_SYNC_4, inherited from the
   alljoyn package.
 - select BR2_PACKAGE_ALLJOYN_BASE_CONTROLPANEL when neither
   BR2_PACKAGE_ALLJOYN_BASE_NOTIFICATION nor
   BR2_PACKAGE_ALLJOYN_BASE_ONBOARDING are selected. This ensures that
   the package will at least build and install one thing.
 - rename the Config.in option prompts from "alljoyn-<foo>" to just
   "<foo>"
 - rework the build command to use a loop rather than duplicate code
 - rework the install command to also use a loop, and to not discard
   errors.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>