prune_suffix() also needs be aware of MLPREFIX when changing PN for
use in BPN.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Currently oe.utils.contains(X, "A", true, false) will return true for substring matches,
e.g. if X = "ABC". This is not what most users expect from the function.

In the common OE use of this function there is the case of "touchscreen" and "screen" being
used as independent variables. Whilst it could be argued there isn't a problem in that
specific case (touchscreens are usually on screens), there is no substring usage of this
function is OE-Core so this patch changes the behaviour to match only full strings.

It also fixes a bug where duplicate entries would confuse multiple matches, e.g.
contains(X, ["A", "B"], ...) would match X = "A A" which is clearly wrong.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Signed-off-by: Chris Larson <chris_larson@mentor.com>

While the metadata can and should rely on bb always being available, this
needn't necessarily be the case for imported python modules.

Signed-off-by: Chris Larson <chris_larson@mentor.com>

Most notable change is the move to creating symlinks to patches in the metadata
tree rather than copying them.

Signed-off-by: Joshua Lock <josh@linux.intel.com>

This library moves the common Python methods into modules of an 'oe' Python
package.

Signed-off-by: Joshua Lock <josh@linux.intel.com>