Installing requirements.txt not affect the all airflow containers.

[Akbarhusen]

Ex. I want to use boto3 but when i run "pip install boto3" or after adding in requirements.txt and doing "pip install -r requirements.txt",
Then still logs says boto3 import error.

So i have to install this in all containers (worker, web server, scheduler, etc) manually to use boto3 in airflow.