Fix #1494: WithClientIP(MatchOperator, params IStringMatcher[]) ignores the MatchOperator argument

[Bafyn]

Problem

WithClientIP(MatchOperator matchOperator, params IStringMatcher[] matchers) ignored its matchOperator argument and always used MatchOperator.Or. Combining multiple client-IP matchers with And (or Average) had no effect - the request matched if any matcher matched, even when all were required.

Tests

Added Request_WithClientIP_MatchOperator_And_RequiresAllMatchers: with And, an IP that matches only one of two matchers is a mismatch (0.0), and one matching both is 1.0.

References

Fixes #1494

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