makedirs py3 change: OSError

Change-Id: I597d163440603b2ec584196987dd01fa2a469d11
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
diff --git a/lib/gen_misc.py b/lib/gen_misc.py
index 7651937..3f869f5 100755
--- a/lib/gen_misc.py
+++ b/lib/gen_misc.py
@@ -68,7 +68,7 @@
     gp.qprint_issuing("os.makedirs('" + path + "', mode=" + oct(mode) + ")")
     try:
         os.makedirs(path, mode)
-    except FileExistsError:
+    except OSError:
         pass