fix: pending messages should only be cleared if there is a discrepancy between what we requested regarding the session and what the server responds with

[amokfa]

…

Type of change

Make sure session cleaning on the client side happens as per the mqtt specification. (Section 3.1.2.4 of mqtt 3.1.1 specification)

Checklist:

• Formatted with cargo fmt
• Make an entry to CHANGELOG.md if it's relevant to the users of the library. If it's not relevant mention why.

[coveralls]

Pull Request Test Coverage Report for Build 11567567609

Details

• 3 of 11 (27.27%) changed or added relevant lines in 2 files are covered.
• 113 unchanged lines in 6 files lost coverage.
• Overall coverage decreased (-0.04%) to 36.066%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
rumqttc/src/v5/state.rs	0	8	0.0%

Files with Coverage Reduction	New Missed Lines	%
rumqttc/src/v5/state.rs	4	67.09%
rumqttc/src/eventloop.rs	5	85.03%
rumqttd/src/link/timer.rs	8	0.0%
rumqttd/src/link/remote.rs	25	46.03%
rumqttc/src/v5/eventloop.rs	28	7.51%
rumqttd/src/link/bridge.rs	43	0.0%

Totals
Change from base Build 10511632669:	-0.04%
Covered Lines:	5987
Relevant Lines:	16600

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💛 - Coveralls