[docker-sonic-mgmt]: Include patch to support 'become' and 'become_user' arguments in pytest-ansible

[ArunSaravananBalachandran]

- Why I did it

• To support 'become' and 'become_user' arguments in pytest-ansible in 'docker-sonic-mgmt'

Required by sonic-mgmt/PR1702 : [pytest] Convert interface naming mode test to pytest

- How I did it

Apply pytest-ansible/PR46 patch to pytest-ansible while building 'docker-sonic-mgmt'.

- How to verify it

Use 'become', 'become_user' arguments in pytest script to login as a different user into host device.

- Description for the changelog

[docker-sonic-mgmt]: Include patch to support 'become' and 'become_user' arguments in pytest-ansible

- A picture of a cute animal (not mandatory but encouraged)

[lguohan]

retest baseimage please

[lguohan]

grab the source and use python setup.py to build and install

[ArunSaravananBalachandran]

grab the source and use python setup.py to build and install

@lguohan , as suggested made changes to build pytest-ansible from source using setup.py.
Install of latest ansible (2.9.9) was failing, which was initiated automatically by easy_install since it is a dependency of pytest-ansible.
So, the installation of pytest-ansible is performed after ansible has been installed to avoid the failure.

[lguohan]

please check out a specific version.

[lguohan]

grab the source and use python setup.py to build and install

@lguohan , as suggested made changes to build pytest-ansible from source using setup.py.
Install of latest ansible (2.9.9) was failing, which was initiated automatically by easy_install since it is a dependency of pytest-ansible.
So, the installation of pytest-ansible is performed after ansible has been installed to avoid the failure.

I am ok with this change.