Remove built-in support for uWSGI

[jacobstanly89]

Fixes #1530

Changes proposed in this pull request:

• From connexion/operations/abstract.py,

Remove check for UWSGI metrics and to remove adding of the corresponding function decorator.

if UWSGIMetricsCollector.is_available(): # pragma: no cover decorator = UWSGIMetricsCollector(self.path, self.method) function = decorator(function)

Remove the following import

from ..decorators.metrics import UWSGIMetricsCollector

• Delete the files tests/test_metrics.py and connexion/decorators/metrics.py

[coveralls]

Pull Request Test Coverage Report for Build 2375482539

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.06%) to 94.338%

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Totals
Change from base Build 2341371900:	0.06%
Covered Lines:	2649
Relevant Lines:	2808

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💛 - Coveralls

[RobbeSneyders]

Thanks @jacobstanly89