test.py: use XPath for iterating in "TestSuite/TestSuite"

before this change, we check for the existence of "TestSuite" node
under the root of XML tree, and then enumerating all "TestSuite" nodes
under this "TestSuite", this approach works. but it

* introduces unnecessary indent
* is not very readable

in this change, we just use "./TestSuite/TestSuite" for enumerating
all "TestSuite" nodes under "TestSuite". simpler this way.

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

test.py

@@ -1721,11 +1721,9 @@ def boost_to_junit(boost_xml, junit_xml):
 
     # report produced {write_consolidated_boost_junit_xml} have the next structure suite_boost -> [suite1, suite2, ...]
     # so we are excluding the upper suite with name boost
-    boost_suite = boost_root.find('TestSuite')
-    if boost_suite is not None:
-        test_suites = boost_suite.findall('TestSuite')
-
-        for test_suite in test_suites:
+    for test_suite in boost_root.findall('./TestSuite/TestSuite'):
+        # TODO: fix the indent
+        if True:
             suite_time = 0.0
             suite_test_total = 0
             suite_test_fails_number = 0