wic/engine.py: Load paths from PATH environment variable
Load self.paths from environment variable and
if it fails, fall back to hardcoded list.
This is required for users that would need to load
different e2fsprogs binaries if their system's ones
are not recent enought
(From OE-Core rev:
a88bcbae850a2e6d182291d3f8e167aabdbe4842)
Signed-off-by: William Bourque <wbourque@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
