Split the code from create_sandbox into two separate functions and remove the noqa: C901.

Describe alternatives you've considered
Simplify the function such that no split is required.

Additional context
Code quality:

2020-04-29T13:13:32.5968940Z ./syft/sandbox.py:12:1: C901 'create_sandbox' is too complex (26)
2020-04-29T13:13:32.5969257Z def create_sandbox(gbs, 

How to install:

• pkg install wget ca_root_nss #necessary package installation
• wget https://static.adguard.com/adguardhome/release/AdGuardHome_freebsd_amd64.tar.gz #binary archive download
• tar -xvf AdGuardHome_freebsd_amd64.tar.gz #unzip it in the same folder as the downloaded one.
• chmod -R 755 ./AdGuardHome #confirm rights to execution
• nohup ./AdGuardHome/AdGuardHome & # start the

Besides #4521 and #4656.
We have several .ipynb files

• Trustchain sim tutorial
  • https://github.com/grimadas/BlockchainEngineering/blob/master/00_Overview.ipynb
  • https://github.com/grimadas/BlockchainEngineering/blob/master/02_Services.ipynb
• [incremental-pagerank](https://github.com/Tribler/incremental-pagerank/blob/master/Report.ip