cooker: use re match, not search in re_match_strings

We want to match the requested pattern at the beginning of the string,
otherwise things behave in an unintuitive manner wrt ASSUME_PROVIDED (e.g.
ASSUME_PROVIDED += "gtk+" will also assume foo-gtk+ is provided), and the user
can always use '.*gtk+' to get the old behavior.

(Bitbake rev: 5670134ab2eb573d39df3c3231677cdb1a1dfc72)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

bitbake/lib/bb/taskdata.py

@@ -34,7 +34,7 @@ def re_match_strings(target, strings):
     Whether or not the string 'target' matches
     any one string of the strings which can be regular expression string
     """
-    return any(name == target or re.search(name, target) != None
+    return any(name == target or re.match(name, target)
                for name in strings)
 
 class TaskData: