[CRM] Wait more time for CRM stats to update - 201811 branch

[wangxin]

Description of PR

Summary:
Fixes # (issue)

CRM testing may fail because CRM stats was not updated yet
while checking the counters. Main purpose of this change is
to increase the time waiting for CRM update from 2 seconds
to 4 seconds. Two other improvements:

• Decrease the time waiting for CRM counters update from
  300 seconds to 30 seconds. The 300 seconds waiting is
  unnecessary.
• Use a single redis-cli command to get used and available
  counters rather than two commands.

Because there was conflict merging PR #1027 to 201811 branch, I resolved the conflicts, tested again and created this PR to the 201811 branch.

Type of change

• Bug fix
• [] Testbed and Framework(new/improvement)
• [] Test case(new/improvement)

Approach

How did you do it?

• Increase the time waiting for CRM counters update from 2 seconds to 4 seconds.
• Decrease the time waiting for CRM counters update from 300 seconds to 30 seconds.
• Use a single redis-cli command to get used and available counters rather than two commands.

How did you verify/test it?

Tested on Mellanox platform.

TASK [test : debug] ************************************************************
task path: /root/code/sonic-mgmt/ansible/roles/test/tasks/test_sonic_by_testname.yml:44
Sunday 04 August 2019  03:46:17 +0000 (0:00:00.611)       0:29:06.041 ********* 
ok: [mtbc-sonic-03-2700-t0] => {
    "msg": [
        "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!", 
        "!!!!!!!!!!!!!!!!!!!! end running test crm !!!!!!!!!!!!!!!!!!!!!!", 
        "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
    ]
}

TASK [test : include] **********************************************************
task path: /root/code/sonic-mgmt/ansible/roles/test/tasks/main.yml:8
Sunday 04 August 2019  03:46:18 +0000 (0:00:00.158)       0:29:06.199 ********* 
skipping: [mtbc-sonic-03-2700-t0] => {"changed": false, "skip_reason": "Conditional check failed", "skipped": true}

PLAY ***************************************************************************
skipping: no hosts matched

PLAY RECAP *********************************************************************
mtbc-sonic-03-2700-t0      : ok=2390 changed=762  unreachable=0    failed=0   

Sunday 04 August 2019  03:46:18 +0000 (0:00:00.096)       0:29:06.296 ********* 
=============================================================================== 
TASK: test : Make sure CRM counters updated ---------------------------- 30.11s
TASK: test : Copy loganalyzer common match and ignore files to switch -- 15.24s
TASK: test : Copy loganalyzer common match and ignore files to switch -- 14.65s
TASK: test : Copy loganalyzer common match and ignore files to switch -- 14.29s
TASK: test : Copy loganalyzer common match and ignore files to switch -- 12.98s
TASK: test : Copy loganalyzer common match and ignore files to switch -- 11.11s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 9.79s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 9.47s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 7.96s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 7.90s
TASK: test : Get ethertype for ACL entry in order to match ACL which was configured --- 7.51s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 7.08s
TASK: test : Get ethertype for ACL entry in order to match ACL which was configured --- 6.87s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 6.36s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 6.10s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 6.08s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 5.99s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 5.59s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 5.49s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 5.44s

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation