port: remove trust service url references

[joshgummersall]

Fixes #3259

[coveralls]

Pull Request Test Coverage Report for Build 549093157

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 45 unchanged lines in 4 files lost coverage.
• Overall coverage increased (+0.01%) to 84.817%

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Files with Coverage Reduction	New Missed Lines	%
libraries/adaptive-expressions/src/triggerTrees/trigger.ts	2	63.08%
libraries/botframework-connector/src/auth/appCredentials.ts	3	90.91%
libraries/botframework-connector/src/auth/jwtTokenValidation.ts	5	88.73%
libraries/botbuilder/src/botFrameworkAdapter.ts	35	88.94%

Totals
Change from base Build 549091919:	0.01%
Covered Lines:	18505
Relevant Lines:	20806

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💛 - Coveralls

[stevengum]