Enhance reboot_sonic.yml to be suitable for all types of reboot

[romankachur-mlnx]

1. Modified roles/test/tasks/common_tasks/reboot_sonic.yml

Description of PR

Summary:
The scenario reboot_sonic.yml which is used for reboot of sonic,
was modified to support other types of reboot: fast-reboot and warm-reboot.
It is possible to extend it to support any other type of reboot.

Type of change

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

Approach

How did you do it?

1. I defined possible (and allowed) types of reboots:
   reboot_types: ["reboot", "fast-reboot", "warm-reboot" ]
2. The desired reboot type may be passed as reboot_type external parameter:
   ansible-playbook reboot.yml -e reboot_type=< reboot | fast-reboot | warm-reboot >
3. Default reboot type is set to regular reboot, so reboot_type parameter is not mandatory, and the scenario may be used as before.
4. Sonic is rebooted with a unified step:
   command: "{{ reboot_type }}"
5. The reboot_type parameter is cheched against allowed values,
   - fail:
   ....
   when: reboot_type not in reboot_types
   So that it would not be possible to pass malicious commands to the sonic.

How did you verify/test it?

I tested it with regular reboot and, fast-reboot, and with default value:

1. ansible-playbook ..... -e testcase_name=continuous_reboot ... -e reboot_type=fast-reboot
2. ansible-playbook ..... -e testcase_name=continuous_reboot ... -e reboot_type=reboot
3. ansible-playbook ..... -e testcase_name=continuous_reboot ...

Any platform specific information?

N/A

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

N/A

Documentation

N/A