[BUGFIX 183119](iOS) crash app during desconnect, due to concurrent access of notifications mutable array
[BUGFIX 183119](iOS) crash app during desconnect, due to concurrent access of notifications mutable array

Change-Id: I88cc95e8f6e56dccf32ff503b47e4f58409fb567
Reviewed-on: https://gerrit.parrot.biz/27017
Reviewed-by: Cyril HERVOUIN <51dc5d954a834f6aaf208d64f1b5b413363be33d@parrot.com>
Reviewed-by: Melody Potron <256f6323a744ac0e59a9b9ab844fcafa1b310daa@parrot.com>
Reviewed-by: Djavan Bertrand <7232792b712c7d1777e4e988572ac52f60124955@parrot.com>

Parrot-Developers/libARSAL,Parrot-Developers/libARSAL,Parrot-Developers/libARSAL