Add two scripts: "nextid" finds the next available test ID number in a
group, and "mvtest" relocates a test, fixes the golden output, and
moves the group entry for that test.
v2: sorting group files should preserve group order; nextid should use
the same algorithm as new; move both tools to tools/.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Darrick J. Wong