[BotBuilder][4.8] Compilation error due to different AppCredential used

[Batta32]

Versions

What package version of the SDK are you using.
4.8.0 from MyGet
What nodejs version are you using
10.8.0
What browser version are you using
-
What os are you using
Windows 10

Describe the bug

Give a clear and concise description of what the bug is.
Using 4.8.0 of botbuilder's packages from MyGet, it throws a compilation's error.

This error shows up as AppCredentials of the method exchangeToken in BotFrameworkAdapter and ExtendedUserTokenProvider are different.

BotFrameworkAdapter uses AppCredentials from botframework-connector, howerver ExtendedUserTokenProvider uses AppCredentials from botbuilder-core.

To Reproduce

Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

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The compilation of the botbuilder's packages should work correctly.

Screenshots

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Additional context

Add any other context about the problem here.
These changes are in master and in 4.8 branch

[bug]

[stevengum]

Closing as fix was merged to 4.8 and cherry-picked to master.