Upgrade to release 1.5.1:
- support signed integers in `util.ba2int()` and `util.int2ba()`
- deprecate `.length()` in favor of `len()`
Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Acked-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
