remove dependency on unittest2 module

The dependency of fio-histo-log-pctiles.py on unittest2 module was causing heartburn
for pbench community so I removed the dependency.
If unittest2 python package is installed and unittest2 module can be imported,
that's fine, we'll use it if requested,
but if it's not, that's fine too, you can still use the program.

diff --git a/tools/hist/fio-histo-log-pctiles.py b/tools/hist/fio-histo-log-pctiles.py
index c398113c12bd5423859bd3e01710fb5bd04f5570..bb016ead8590b5b3e1cfe67c06c0aa25a67fb7bf 100755 (executable)
--- a/tools/hist/fio-histo-log-pctiles.py
+++ b/tools/hist/fio-histo-log-pctiles.py
@@ -24,7 +24,12 @@
 import sys, os, math, copy
 from copy import deepcopy
 import argparse
-import unittest2
+
+unittest2_imported = True
+try:
+    import unittest2
+except ImportError:
+    unittest2_imported = False
 
 msec_per_sec = 1000
 nsec_per_usec = 1000
@@ -412,14 +417,14 @@ def compute_percentiles_from_logs():
 #end of MAIN PROGRAM
 
 
-
 ##### below are unit tests ##############
 
-import tempfile, shutil
-from os.path import join
-should_not_get_here = False
+if unittest2_imported:
+  import tempfile, shutil
+  from os.path import join
+  should_not_get_here = False
 
-class Test(unittest2.TestCase):
+  class Test(unittest2.TestCase):
     tempdir = None
 
     # a little less typing please
@@ -651,7 +656,10 @@ class Test(unittest2.TestCase):
 
 if __name__ == '__main__':
     if os.getenv('UNITTEST'):
-        sys.exit(unittest2.main())
+        if unittest2_imported:
+            sys.exit(unittest2.main())
+        else:
+            raise Exception('you must install unittest2 module to run unit test')
     else:
         compute_percentiles_from_logs()