Add userId parameter to signOutUser

[Aliandi]

Parity with C#

Description

It was found that the TypeScript method signOutUser() differed from the C# implementation of signOutUserAsync(). The TypeScript version expects less parameters, not letting the user pass a userId.

TypeScript
public async signOutUser(context: TurnContext, connectionName: string): Promise<void>

C#
public virtual async Task SignOutUserAsync(ITurnContext turnContext, string connectionName = null, string userId = null, CancellationToken cancellationToken = default(CancellationToken))

Specific Changes

• add userId optional parameter to the method
• add handling for when userId is null

[coveralls]

Pull Request Test Coverage Report for Build #2187

• 0 of 2 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.006%) to 88.254%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
libraries/botbuilder/src/botFrameworkAdapter.ts	0	2	0.0%

Totals
Change from base Build #2186:	0.006%
Covered Lines:	3234
Relevant Lines:	3521

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💛 - Coveralls

[stevengum]

@cleemullins, @BruceHaley any idea on this BotBuilder-JS-master-4.4-CI build? I just noticed this isn't in 4.3.x for JS but it is for C#....