Worker processes do not start in linear time

[paulbatum]

The functions host adds worker processes more slowly than intended and as documented. Here are the details provided by @cgillum -

According to this documentation, I should expect to wait 100 seconds before all 10 python worker processes are available.
https://docs.microsoft.com/en-us/azure/azure-functions/functions-app-settings#functions_worker_process_count

What I actually observed is that we take 10 seconds for the second python process to be created and 10 more seconds for each additional python worker process. Here is my Functions log output which illustrates what I mean: 

[2021-02-03T21:33:57.717] Worker process started and initialized.
[2021-02-03T21:34:07.667] Worker process started and initialized.
[2021-02-03T21:34:27.649] Worker process started and initialized.
[2021-02-03T21:34:57.652] Worker process started and initialized.
...
[2021-02-03T21:41:27.695] Worker process started and initialized.

It took 390 seconds before all 10 python worker processes came up.

[fabiocav]

@paulbatum moving this to sprint 96 .

[fabiocav]

Moving this back to triaged as the work needs to be restarted.

@alrod are you planning on picking this up?

[alrod]

picking up and assigning to current sprint

[fabiocav]

PR currently in review. Leaving this item in sprint 97