Enable extra table test

[praveen-li]

- What I did
[sonic-utilities-tests/config_mgmt_test.py]: Enable test for extra table in config.

After merging https://github.com/zhenggen-xu/sonic-buildimage/pull/69
enabling test for extra table in config.

Signed-off-by: Praveen Chaudhary [email protected]

- How I did it

- How to verify it
Build again.

pchaudha@server05:/home/pchaudha/srcCode/dpb_repo$ date
Tue Jun 30 15:13:36 PDT 2020
pchaudha@server05:/home/pchaudha/srcCode/dpb_repo$ ls -l target/python-debs/python-sonic-utilities_1.2-1_all.deb
-rw-r--r-- 1 pchaudha pchaudha 153218 Jun 30 15:08 target/python-debs/python-sonic-utilities_1.2-1_all.deb
pchaudha@server05:/home/pchaudha/srcCode/dpb_repo$

- Previous command output (if the output of a command-line utility has changed)

- New command output (if the output of a command-line utility has changed)