fix pep8 lint errors in the rest of the tools

no functional changes

Signed-off-by: Alexei Starovoitov <ast@fb.com>
diff --git a/tools/killsnoop_example.txt b/tools/killsnoop_example.txt
index f80dc77..f968f79 100644
--- a/tools/killsnoop_example.txt
+++ b/tools/killsnoop_example.txt
@@ -3,7 +3,7 @@
 
 This traces signals sent via the kill() syscall. For example:
 
-# ./killsnoop 
+# ./killsnoop
 PID    COMM             SIG  TPID   RESULT
 17064  bash             9    27682  0
 17064  bash             9    27682  -3