[svn-r15900] Make the h5copy test that renames a group to return 1 on the h5diff call and assume 1 is the correct result

Drop the -c flag for h5diff

Tested: linux

tools/h5diff/testfiles/h5diff_623.txt

@@ -10,7 +10,6 @@ usage: h5diff [OPTIONS] file1 file2 [obj1[obj2]]
    -r, --report            Report mode. Print differences
    -v, --verbose           Verbose mode. Print differences, list of objects
    -q, --quiet             Quiet mode. Do not do output
-   -c, --contents          Ignore graph contents differences in return value
    -n C, --count=C         Print differences up to C number
    -d D, --delta=D         Print difference when greater than limit D
    -p R, --relative=R      Print difference when greater than relative limit R