[Telemetry] Improve _GetProcJiffies operation with using grep.

tools/telemetry/unittest_data/timer_list

Index: tools/telemetry/unittest_data/timer_list
diff --git a/tools/telemetry/unittest_data/timer_list b/tools/telemetry/unittest_data/timer_list
deleted file mode 100644
index d7ff1697681bb000ee0b92323fb6332440f82a8b..0000000000000000000000000000000000000000
--- a/tools/telemetry/unittest_data/timer_list
+++ /dev/null
@@ -1,62 +0,0 @@
-Timer List Version: v0.7
-HRTIMER_MAX_CLOCK_BASES: 4
-now at 49390649032656 nsecs
-
-cpu: 0
- clock 0:
-  .base:       0000000000000000
-  .index:      0
-  .resolution: 1 nsecs
-  .get_time:   ktime_get
-  .offset:     0 nsecs
-active timers:
- #0: <0000000000000000>, hrtimer_wakeup, S:01, schedule_hrtimeout_range_clock, census_census_h/2343
- # expires at 49390651724646-49390651774646 nsecs [in 2691990 to 2741990 nsecs]
- #1: <0000000000000000>, hrtimer_wakeup, S:01, schedule_hrtimeout_range_clock, census_census_h/3680
- # expires at 49390656983466-49390657033466 nsecs [in 7950810 to 8000810 nsecs]
- clock 1:
-  .base:       0000000000000000
-  .index:      1
-  .resolution: 1 nsecs
-  .get_time:   ktime_get_real
-  .offset:     1414432541083798144 nsecs
-active timers:
- #0: <0000000000000000>, hrtimer_wakeup, S:01, hrtimer_start_range_ns, mysqld/27245
- # expires at 1414481934522781000-1414481934522831000 nsecs [in 1414432543873748344 to 1414432543873798344 nsecs]
- #1: <0000000000000000>, hrtimer_wakeup, S:01, hrtimer_start_range_ns, DNS Res~ver #14/21520
- # expires at 1414482222918140000-1414482222918190000 nsecs [in 1414432832269107344 to 1414432832269157344 nsecs]
- clock 2:
-  .base:       0000000000000000
-  .index:      2
-  .resolution: 1 nsecs
-  .get_time:   ktime_get_boottime
-  .offset:     0 nsecs
-active timers:
- clock 3:
-  .base:       0000000000000000
-  .index:      3
-  .resolution: 1 nsecs
-  .get_time:   ktime_get_clocktai
-  .offset:     1414432541083798144 nsecs
-active timers:
-  .expires_next   : 49390651774646 nsecs
-  .hres_active    : 1
-  .nr_events      : 9793846
-  .nr_retries     : 580
-  .nr_hangs       : 0
-  .max_hang_time  : 0 nsecs
-  .nohz_mode      : 2
-  .last_tick      : 49390648000000 nsecs
-  .tick_stopped   : 1
-  .idle_jiffies   : 4307239958
-  .idle_calls     : 16879086
-  .idle_sleeps    : 15799778
-  .idle_entrytime : 49390647721066 nsecs
-  .idle_waketime  : 49390647714831 nsecs
-  .idle_exittime  : 49390647489308 nsecs
-  .idle_sleeptime : 44326049938322 nsecs
-  .iowait_sleeptime: 1007311574977 nsecs
-  .last_jiffies   : 4307239958
-  .next_jiffies   : 4307239968
-  .idle_expires   : 49390684000000 nsecs
-jiffies: 4307239953