Improves compatibility with AddressSanitizers

Address sanitizers is expecting shared objects loaded
without the flag RTLD_DEEPBIND. This can be achieved
by setting the environment variable AFB_NO_RTLD_DEEPBIND
to the value 1 (exactly).

This implies that the binder takes care of not clashing
the namespaces by defining the symbol afbBindingV3root
in both environment: the binder and the bindings.

Bug-AGL: SPEC-3040
Bug-AGL: SPEC-3162

Signed-off-by: José Bollo <jose.bollo@iot.bzh>
Change-Id: Ic064590178d4cf8b34b939e4c9ecd587668f71b8