fix pep8 lint errors in biolatency and biosnoop

Signed-off-by: Alexei Starovoitov <ast@fb.com>

tools/biolatency

 #!/usr/bin/python
+# @lint-avoid-python-3-compatibility-imports
 #
 # biolatency    Summarize block device I/O latency as a histogram.
 #       For Linux, uses BCC, eBPF.
@@ -124,7 +125,7 @@ while (1):
     try:
         sleep(int(args.interval))
     except KeyboardInterrupt:
-		exiting=1
+        exiting = 1
 
     print()
     if args.timestamp:

tools/biosnoop

 #!/usr/bin/python
+# @lint-avoid-python-3-compatibility-imports
 #
 # biosnoop  Trace block device I/O and print details including issuing PID.
 #       For Linux, uses BCC, eBPF.
@@ -97,7 +98,7 @@ int trace_req_completion(struct pt_regs *ctx, struct request *req)
 
     return 0;
 }
-""")
+""", debug=0)
 b.attach_kprobe(event="blk_account_io_start", fn_name="trace_pid_start")
 b.attach_kprobe(event="blk_start_request", fn_name="trace_req_start")
 b.attach_kprobe(event="blk_mq_start_request", fn_name="trace_req_start")

tools/biosnoop_example.txt

@@ -36,11 +36,11 @@ $ iostat -x 1
 avg-cpu:  %user   %nice %system %iowait  %steal   %idle
            0.12    0.00    0.12    0.00    0.00   99.75
 
-Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
-xvda              0.00     0.00    0.00    4.00     0.00    16.00     8.00     0.00    0.00    0.00    0.00   0.00   0.00
-xvdb              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
-xvdc              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
-md0               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
+Device: rrqm/s  wrqm/s    r/s    w/s  rkB/s  wkB/s  await  svctm  %util
+xvda      0.00    0.00   0.00   4.00   0.00  16.00   0.00   0.00   0.00
+xvdb      0.00    0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00
+xvdc      0.00    0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00
+md0       0.00    0.00   0.00   0.00   0.00   0.00   0.00   0.00   0.00
 
 There are 4 write IOPS.