ib-verbs error log enhancement

Earlier it was thought that only not having 'opensm' running will cause
handshake errors in ib-verbs.

Recently understood that even having a wrong 'ib-verbs.port' option can
also cause the same behavior, and it took more than 5-6 e-mail iterations
with the user and lot of brain cycle in support team to understand the
problem. Made the log message more descriptive, so user can be find the
cause, or can send us email without wasting time.

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

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