Reworked and fixed xroot tests to use where possible the new (3.3.x)

test/testsuite/castortests/resources/xroot/tags.py

test/testsuite/castortests/xroot/chmod.input

test/testsuite/castortests/xroot/isfileonline.input

test/testsuite/castortests/xroot/isfileonline.output1

test/testsuite/castortests/xroot/isfileonline.output3

test/testsuite/castortests/xroot/isfileonline.output4

test/testsuite/castortests/xroot/isfileonline.output5

test/testsuite/castortests/xroot/mkdir.input

test/testsuite/castortests/xroot/mkdir.output1

test/testsuite/castortests/xroot/online.input

test/testsuite/castortests/xroot/online.output0

test/testsuite/castortests/xroot/online.output1

test/testsuite/castortests/xroot/online.output2

test/testsuite/castortests/xroot/online.output3

test/testsuite/castortests/xroot/online.output4

test/testsuite/castortests/xroot/prestage.input

test/testsuite/castortests/xroot/prestage.output8

test/testsuite/castortests/xroot/rm.input

test/testsuite/castortests/xroot/stat.input

test/testsuite/castortests/xroot/stat.output2