add network_fuzz test case to the test suite

[joej164]

network_fuzz_t1_eight_output.log
network_fuzz_t0_eight_output.log

Description of PR

Summary:
Adds a network fuzz test to the group of tests. The test will send invalid packets to the DUT and verify the system does not become unstable.

Type of change

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

Approach

How did you do it?

Used the PTF and the scapy.py library to send bogus packets

How did you verify/test it?

Used loganalyzer and base_sanity to verify system operation

Any platform specific information?

Requires the use of a PTF

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

Should work on t0 and t1 based topologies

Documentation

Updated the inline documentation with an example of how to run the test

Test Results

Pylint Results:
Pylint found no errors and the python file is python3 compatible. Ran pylint with `pylint -E --py3k'

Command: ansible-playbook -i lab test_sonic.yml -e testbed_name=t0-eight -e testcase_name=network_fuzz

Results:
"PLAY RECAP *********************************************************************
lab-ignw-seastone-dut-li1 : ok=309 changed=70 unreachable=0 failed=0

Monday 02 September 2019 20:35:58 +0000 (0:00:00.076) 0:05:05.496 ******

TASK: test : command --------------------------------------------------- 22.97s
TASK: test : command --------------------------------------------------- 22.73s
TASK: test : command --------------------------------------------------- 20.65s
TASK: test : command --------------------------------------------------- 10.40s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 4.10s
TASK: test : Copy tests to the PTF container ---------------------------- 3.99s
TASK: test : Verify port channel interfaces are up correctly ------------ 3.67s
TASK: test : Verify port channel interfaces are up correctly ------------ 3.48s
TASK: test : Verify port channel interfaces are up correctly ------------ 3.41s
TASK: test : Verify port channel interfaces are up correctly ------------ 3.30s
TASK: test : Verify port channel interfaces are up correctly ------------ 3.28s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 3.24s
TASK: test : Store the indices for the ports that operationally 'up' ---- 3.17s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 3.16s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 2.99s
TASK: test : Validate all interfaces are still up ----------------------- 2.93s
TASK: test : Get the interface name that is connect to the first BGP neighbor --- 2.90s
TASK: test : command ---------------------------------------------------- 2.67s
TASK: test : Validate all interfaces are still up ----------------------- 2.65s
TASK: test : Validate all interfaces are still up ----------------------- 2.65s"

Command: ansible-playbook -i lab test_sonic.yml -e testbed_name=t1-eight -e testcase_name=network_fuzz

Results:
"PLAY RECAP *********************************************************************
lab-ignw-seastone-dut-li1 : ok=295 changed=69 unreachable=0 failed=0

Monday 02 September 2019 19:42:32 +0000 (0:00:00.088) 0:04:26.754 ******

TASK: test : command --------------------------------------------------- 22.83s
TASK: test : command --------------------------------------------------- 16.22s
TASK: test : command --------------------------------------------------- 14.79s
TASK: test : command ---------------------------------------------------- 8.24s
TASK: test : Get the interface name that is connect to the first BGP neighbor --- 5.56s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 4.19s
TASK: test : Copy tests to the PTF container ---------------------------- 3.98s
TASK: test : Store the indices for the ports that operationally 'up' ---- 3.29s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 3.27s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 2.97s
TASK: test : Validate all interfaces are still up ----------------------- 2.85s
TASK: test : Validate all interfaces are still up ----------------------- 2.73s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 2.70s
TASK: test : command ---------------------------------------------------- 2.65s
TASK: test : Validate all interfaces are still up ----------------------- 2.59s
TASK: test : Validate all interfaces are still up ----------------------- 2.58s
TASK: test : Validate all interfaces are still up ----------------------- 2.58s
TASK: test : Copy loganalyzer common match and ignore files to switch --- 2.54s
TASK: test : debug ------------------------------------------------------ 1.90s
TASK: test : Fetch result files from switch to ansible machine ---------- 1.89s"

[joej164]

closing to fix some issues, will reopen when fixed

[joej164]

files fixed, reopening

[praveen-li]

Looks good to me.