Add ps output to show_tech.py

Summary:
# Description

Adding the output of `ps w` to meru and fbdarwin show_tech.py in order to capture the running processes for use in troubleshooting the system state.

X-link: https://github.com/facebookexternal/openbmc.arista/pull/422

Test Plan:
Ran the new show_tech.py and verified the ps output exists. Ran the CIT tests.
## meru
```
root@bmc:~# show_tech.py | grep -A 20 "CURRENTLY"
##### CURRENTLY RUNNING PROCESSES #####
ps w
  PID USER       VSZ STAT COMMAND
    1 root     12104 S    {systemd} /init
    2 root         0 SW   [kthreadd]
    3 root         0 SW   [pool_workqueue_]
    4 root         0 IW<  [kworker/R-rcu_g]
    5 root         0 IW<  [kworker/R-rcu_p]
    6 root         0 IW<  [kworker/R-slub_]
    7 root         0 IW   [kworker/0:0-eve]
    8 root         0 IW<  [kworker/0:0H-ev]
    9 root         0 IW   [kworker/0:1-mm_]
   10 root         0 IW   [kworker/u4:0]
   11 root         0 IW<  [kworker/R-mm_pe]
   12 root         0 IW   [rcu_tasks_rude_]
   13 root         0 IW   [rcu_tasks_trace]
   14 root         0 SW   [ksoftirqd/0]
   15 root         0 IW   [rcu_sched]
   16 root         0 SW   [migration/0]
   17 root         0 SW   [cpuhp/0]
   18 root         0 SW   [cpuhp/1]
```
```
root@bmc:~# python3 /usr/local/bin/tests2/cit_runner.py --platform meru
...
----------------------------------------------------------------------
Ran 15 tests in 172.478s

OK
```
## fbdarwin
```
root@bmc:~# show_tech.py | grep -A 20 "CURRENTLY"
##### CURRENTLY RUNNING PROCESSES #####
ps w
  PID USER       VSZ STAT COMMAND
    1 root     11972 S    {systemd} /init
    2 root         0 SW   [kthreadd]
    3 root         0 SW   [pool_workqueue_]
    4 root         0 IW<  [kworker/R-rcu_g]
    5 root         0 IW<  [kworker/R-rcu_p]
    6 root         0 IW<  [kworker/R-slub_]
    7 root         0 IW   [kworker/0:0-pm]
    8 root         0 IW<  [kworker/0:0H-ev]
    9 root         0 IW   [kworker/0:1-eve]
   10 root         0 IW   [kworker/u4:0]
   11 root         0 IW<  [kworker/R-mm_pe]
   12 root         0 IW   [rcu_tasks_rude_]
   13 root         0 IW   [rcu_tasks_trace]
   14 root         0 SW   [ksoftirqd/0]
   15 root         0 IW   [rcu_sched]
   16 root         0 SW   [migration/0]
   17 root         0 SW   [cpuhp/0]
   18 root         0 SW   [cpuhp/1]
```
```
root@bmc:~# python3 /usr/local/bin/tests2/cit_runner.py --platform fbdarwin
...
----------------------------------------------------------------------
Ran 22 tests in 147.338s

OK (skipped=3)
```

Reviewed By: somasun

Differential Revision: D80857201

Pulled By: joancaneus

fbshipit-source-id: 6ae0af7af3e9649fc8eb453da22e4fe882baa333

Author: srv-openbmc-robot-arista

meta-facebook/meta-fbdarwin/recipes-utils/show-tech/files/show_tech.py

@@ -151,6 +151,12 @@ def gpioDump():
         )
     )
 
+def psOutput():
+    print(
+        "##### CURRENTLY RUNNING PROCESSES #####\n{}".format(
+            runCmd("ps w", echo=True, verbose=True)
+        )
+    )
 
 def showtech(quietLevel=0):
     verbose = not bool(quietLevel)
@@ -180,7 +186,7 @@ def showtech(quietLevel=0):
         i2cDetectDump()
         gpioDump()
         logDump()
-
+        psOutput()
 
 def parseArgs():
     parser = argparse.ArgumentParser(

meta-facebook/meta-meru/recipes-utils/show-tech/files/show_tech.py

@@ -162,6 +162,12 @@ def gpioDump():
         )
     )
 
+def psOutput():
+    print(
+        "##### CURRENTLY RUNNING PROCESSES #####\n{}".format(
+            runCmd("ps w", echo=True, verbose=True)
+        )
+    )
 
 def showtech(quietLevel=0):
     verbose = not bool(quietLevel)
@@ -205,7 +211,7 @@ def showtech(quietLevel=0):
         i2cDetectDump()
         gpioDump()
         logDump()
-
+        psOutput()
 
 def parseArgs():
     parser = argparse.ArgumentParser(