Merge #15597: net: Generate log entry when blocks messages are received unexpectedly

Summary:
ef0019e054734a14214dfbce56611ce4db1688a5 Generate log entry when blocks messages are received unexpectedly. (Patrick Strateman)

Pull request description:

Currently these are incorrectly logged as an unknown command.

Tree-SHA512: dd272388a90b79897f8c1ea6d4c949323fcf75493f3a5b2ec9a26a2cf6a8ee743b497941702f21df8fae0f5b9481444363643379832dbd5053b0cc0b0363de04

Backport of Core PR15597

Test Plan:

ninja
ninja check

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, jasonbcox

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, jasonbcox

Differential Revision: https://reviews.bitcoinabc.org/D6491