Fix build with INSTALL_DEBUG_TOOLS=y

[msosyak]

During SONiC build with INSTALL_DEBUG_TOOLS=y an exception is raised:

[ 01 ] [ target/docker-sonic-mgmt-framework-dbg.gz ]
Traceback (most recent call last):
  File "/usr/local/bin/j2", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/dist-packages/j2cli/cli.py", line 206, in main
    sys.argv[1:]
  File "/usr/local/lib/python2.7/dist-packages/j2cli/cli.py", line 186, in render_command
    result = renderer.render(args.template, context)
  File "/usr/local/lib/python2.7/dist-packages/j2cli/cli.py", line 87, in render
    .render(context) \
  File "/usr/lib/python2.7/dist-packages/jinja2/environment.py", line 1008, in render
    return self.environment.handle_exception(exc_info, True)
  File "/usr/lib/python2.7/dist-packages/jinja2/environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/sonic/dockers/docker-sonic-mgmt-framework/Dockerfile.j2", line 21, in top-level template code
    {% for deb in docker_sonic_mgmt_framework_debs.split(' ') -%}
  File "/usr/lib/python2.7/dist-packages/jinja2/environment.py", line 430, in getattr
    return getattr(obj, attribute)
jinja2.exceptions.UndefinedError: 'docker_sonic_mgmt_framework_debs' is undefined
make: *** [slave.mk:796: target/docker-sonic-mgmt-framework-dbg.gz] Error 1

Why I did it

To Fix SONiC build with INSTALL_DEBUG_TOOLS=y

How I did it

Fixed generate_manifest function to use version prefix in file names

How to verify it

Build SONiC with INSTALL_DEBUG_TOOLS=y

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012

Description for the changelog

Fixed jinja2 error during SONiC build with INSTALL_DEBUG_TOOLS=y

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

[msosyak]

@stepanblyschak @renukamanavalan Please review

[msosyak]

@xumia Could we merge this?