Problem: monitor_t incorrectly deletes socket_t move assignment operator

[gummif]

Solution: Implement a move assignment operator for monitor_t

[coveralls]

Pull Request Test Coverage Report for Build 184

• 14 of 14 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.5%) to 47.295%

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Totals
Change from base Build 178:	1.5%
Covered Lines:	2011
Relevant Lines:	4252

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💛 - Coveralls