nharper285 2f81c44f01
Refactoring proxy lifetime to only shutdown when proxy is out-of-date. (#839)
## Summary of the Pull Request

_What is this about?_
We'd like to refactor the proxy lifecycle to only delete when the proxy is out-of-date - i.e. when the proxy is older than 7 days or a mismatched version. I've changed two files, proxy.py and timer_daily\init.py to check for the version and timestamp before stopping a live proxy. 

## PR Checklist
* [ ] Applies to work item: #xxx
* [ ] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/onefuzz) and sign the CLI.
* [ ] Tests added/passed
* [ ] Requires documentation to be updated
* [x] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

## Info on Pull Request

_What does this include?_
Changes to two files: 
proxy.py: 
- get_or_create() edited to check if timestamp is >7 days.
- Created is_outdated() to check version and timestamp for out-of-date proxy. 
timer_daily/init.py
- Proxy check now includes is_outdated() before determining if a proxy should be shutdown. 

## Validation Steps Performed
Deploying test instance to determine if proxy lives past a single day.
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