Correct RDMA device logging

[372046933]

What problem does this PR solve?

Issue Number:

Problem Summary:
If host has multiple HCAs and no explicit device name was given. The last one is actually used. See

brpc/src/brpc/rdma/rdma_helper.cpp

Lines 430 to 435 in da5468a

	} else {
	g_context = context;
	g_gid_tbl_len = attr.gid_tbl_len;
	g_lid = attr.lid;
	++available_devices;
	}

What is changed and the side effects?

Changed:

Side effects:

• Performance effects(性能影响):

• Breaking backward compatibility(向后兼容性):

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Check List:

• Please make sure your changes are compilable(请确保你的更改可以通过编译).
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