[Backport IE fixes to 1.7] more test fixes to avoid spurious failures, refs #7681 on 1.8/ branch

git-svn-id: http://svn.dojotoolkit.org/src/branches/1.8/dijit@29504 560b804f-0ae3-0310-86f3-f6aa0a117693
(cherry picked from commit 1058941e058b68839be402d47d9434da0dcd0072)

Conflicts:
	tests/layout/robot/BorderContainer_complex.html