Added a telemetry event for amqp connection failure.

[josevalim]

:green_heart: :blue_heart: :purple_heart: :yellow_heart: :heart:

[coveralls]

Pull Request Test Coverage Report for Build 9207a6ab7a099f01d1559d5aedeee26e813e5d6f-PR-120

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 75.897%

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Totals
Change from base Build 3cbc849490e0e9fc599a0b7b4c911fd912c28cae:	0.1%
Covered Lines:	148
Relevant Lines:	195

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💛 - Coveralls