Fix root suite comparison on Windows

[natebosch]

Fixes #2037

Canonicalize paths when checking whether a stack frame is coming from
the test suite root.

Add a test case which runs with an absolute path argument. On windows,
this situation would have resulted in the root_ location information
being missing because of a difference in the stack frame paths and the
suite path before canonicalization. This test fails on windows without
the canonicalization.

Make the test utils more flexible to handle the new output differences
across operation systems.
Allow a Matcher value for the path argument to suiteJson. This
optional argument had previously been unused. Use equalsIgnoreCase
because on windows there is a difference in the case of the drive
letter.
Allow a Matcher value for the name argument to testStartJson. Take
an Object to allow either Matcher or String for existing uses.
Check the "loading" output line loosely by checking only the start and
end.