logging error with 1.2.0 version
🐛 Bug
if I use logger named "lightning", logger print log twice.
It happens with pytorch-lightning  1.2.0 version and doesn't happend with 1.1.8 version.
This is reproduced easily like below.
Error Example
Type "help", "copyright", "credits" or "license" for more information.
>>> import pytorch_lightning as pl
>>> import logging
>>> logger = logging.getLogger("lightning")
>>> logger.info("test")
test
>>> logging.basicConfig(level=logging.INFO)
>>> logger.info("test")
test
INFO:lightning:test
>>> pl.__version__
'1.2.0'
>>> import pytorch_lightning as pl
>>> import logging
>>> logger = logging.getLogger("lightning")
>>> logger.info("test")
>>> logging.basicConfig(level=logging.INFO)
>>> logger.info("test")
INFO:lightning:test
>>> pl.__version__
'1.1.8'
Please reproduce using the BoringModel
Don't need model.
To Reproduce
Refer above codes 1.2.0 version
Expected behavior
Refer above codes 1.1.8 version
Environment

PyTorch Version (e.g., 1.0): 1.2.0
OS (e.g., Linux): Ubuntu 20.04.1 LTS
How you installed PyTorch (conda, pip, source): pip
Build command you used (if compiling from source):
Python version: 3.7,9
CUDA/cuDNN version:
GPU models and configuration:
Any other relevant information:

Additional context