STAR-247: remove format specific parts of assertions

in offline_tools_test.py

(cherry picked from commit c318850)
(cherry picked from commit 14050b8)
(cherry picked from commit c733919)
(cherry picked from commit 33f3e3f)
(cherry picked from commit 3c72c8f)
(cherry picked from commit a9e646d)
(cherry picked from commit 2225baf)
(cherry picked from commit 43fd7db)

offline_tools_test.py

@@ -277,9 +277,9 @@ def test_sstableverify(self):
             hashcomputed = False
             for line in outlines:
                 if sstable in line:
-                    if "Verifying BigTableReader" in line:
+                    if "Verifying " in line:
                         verified = True
-                    elif "Checking computed hash of BigTableReader" in line:
+                    elif "Checking computed hash of " in line:
                         hashcomputed = True
                     else:
                         logger.debug(line)