Global.json file prevents building on newest SDK

[goldstar611]

Describe the bug
Following build instructions on Ubuntu Linux 16.04, running any commands that involves dotnet fails with the following error:

user@ubuntu:~/Desktop/AttackSurfaceAnalyzer/Tools$ dotnet tool install ElectronNET.CLI -g --version 0.0.11-custom --add-source packages

user@ubuntu:~/Desktop/AttackSurfaceAnalyzer/Tools$ dotnet --version
A compatible SDK version for global.json version: [2.2.105] from [/home/user/Desktop/AttackSurfaceAnalyzer/global.json] was not found
Did you mean to run dotnet SDK commands? Please install dotnet SDK from:
  https://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409

user@ubuntu:~/Desktop/AttackSurfaceAnalyzer/Tools$ cd ..

user@ubuntu:~/Desktop/AttackSurfaceAnalyzer$ dotnet --version
A compatible SDK version for global.json version: [2.2.105] from [/home/user/Desktop/AttackSurfaceAnalyzer/global.json] was not found
Did you mean to run dotnet SDK commands? Please install dotnet SDK from:
  https://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409

user@ubuntu:~/Desktop/AttackSurfaceAnalyzer$ cd ..

user@ubuntu:~/Desktop$ dotnet --version
2.2.202

Ok, so dotnet will fail hard if it finds a global.json file. I finally got the version out of dotnet after changing to the Desktop directory. I have 2.2.202

Inspecting the global.json file that ships with ASA source code we can see a value of 2.2.105. Changing this to the version I have 2.2.202 makes dotnet happy.

To Reproduce
Steps to reproduce the behavior:

1. Create a new Ubuntu VM
2. Install dotnet as found in https://dotnet.microsoft.com/download/linux-package-manager/ubuntu16-04/sdk-2.2.202
3. git clone ASA
4. Follow the build instructions at https://github.com/Microsoft/AttackSurfaceAnalyzer/blob/master/BUILD.md

Expected behavior
Installing a higher version of dotnet works just fine

Screenshots
N/A

System Configuration (please complete the following information):

• OS: Ubuntu 16.04
• OS Version: 16.04.6
• Application Version: master
• CLI or GUI: Tools

Additional Context
Add any other context about the problem here.

[gfs]

Thanks. I think I can just remove the Global.json file to avoid running into this.