Modify observe connection shutdown probe log

[jiayoukun]

For the bpf_sk_storage_get function, for an sk that may have been closed to get the storage associated with it, it usually returns NULL, and this part of the judgement log level should be changed to INFO, and the subsequent tcp_report(sk, tcp_sock, storage, BPF_TCP_ CLOSE) also reports on this connection closure.

[kmesh-bot]

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[jiayoukun]

@LiZhenCheng9527 @nlgwcy

[jiayoukun]

@LiZhenCheng9527 like this

[LiZhenCheng9527]

@LiZhenCheng9527 like this

thanks