Globally replace 'base_contains' calls with 'bb.utils.contains'

Globally replace 'base_contains' calls with 'bb.utils.contains'

The base_contains is kept as a compatibility method and we ought to
not use it in OE-Core so we can remove it from base metadata in
future.

(From OE-Core rev: d83b16dbf0862be387f84228710cb165c6d2b03b)

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>