Improve --info output

[steveharter]

This is for the CLI side of issue: https://github.com/dotnet/core-setup/issues/3502

We'd like to get these changes into 2.1.

Current:

.NET Command Line Tools (2.1.300-preview2-008210)

Product Information:
 Version:            2.1.300-preview2-008210
 Commit SHA-1 hash:  f6065dcc62

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.16299
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\2.1.300-preview2-008210\

Proposed (per Kathleen)

.NET Core SDK (reflecting any global.json):
  Version: 2.1.300-preview2-008210
  Commit:  f6065dcc62

Runtime environment:
 OS Name:     Windows
 OS Version:  10.0.16299
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\2.1.300-preview2-008210\

cc @KathleenDollard @livarcocc

[KathleenDollard]

This will appear above the output from the host --info (per https://github.com/dotnet/core-setup/issues/3502)

Looks good to me.

[livarcocc]

Working on it now.