[ibverbs] fix compile in old version ibverbs

[poor-circle]

Why

Some versoin of libibverbs dont support find best gid index.

What is changing

select default git as zero if ibverbs dont support.

Example

[github-actions]

for detail, goto summary download Artifacts base-ylt-cov-report(base commit coverage report) and ylt-cov-report(current pull request coverage report)