SkillHostAdapter Constructor updates

[gabog]

Removed IBot from the BotFrameworkSkillHostAdapter/SkillHostAdapter constructos (and the related property) and updated the code to use the IBot instance passed in the BotFrameworkHttpSkillsServer.ProcessAsync()

Updated unit tests project to use XUnit.

Relates to #2774

[coveralls]

Pull Request Test Coverage Report for Build 84619

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-1.4%) to 76.014%

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Totals
Change from base Build 84533:	-1.4%
Covered Lines:	7926
Relevant Lines:	10427

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💛 - Coveralls

[fuselabs]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.Luis.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.QnA.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.ApplicationInsights.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Dialogs.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.TemplateManager.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Configuration.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Connector.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Schema.dll compared against version 4.5.3

[tomlm]

    /// <param name="bot">bot callback to use in the turn context.</param>

remove

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Refers to: libraries/Microsoft.Bot.Builder.Skills/Adapters/BotFrameworkSkillHostAdapter.cs:68 in 90899d7. [](commit_id = 90899d7, deletion_comment = False)

[tomlm]