Bump to 3.15.0-rc5

Change-Id: I7ac69a1d68f95ba08a9a47a0b10655e044f672e4
Signed-off-by: Philippe Coval <philippe.coval@open.eurogiciel.org>
wip

Change-Id: I62f1e93639f6a1bcde3c0bea4d9446094e055b28
Signed-off-by: Philippe Coval <philippe.coval@open.eurogiciel.org>