Integration tests for secure and nonsecure connections

[coveralls]

Pull Request Test Coverage Report for Build 760858557

• 21 of 128 (16.41%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-1.09%) to 63.496%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main.rs	0	1	0.0%
postgre_sql/wire_protocol/src/connection.rs	21	34	61.76%
postgre_sql/wire_protocol/src/lib.rs	0	30	0.0%
node_engine/src/lib.rs	0	63	0.0%
<!--	Total:	21	128	16.41%	-->

Totals
Change from base Build 756468461:	-1.09%
Covered Lines:	2637
Relevant Lines:	4153

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💛 - Coveralls