core: 1.8 ABI compat

[jiaxiyan]

ABI version is updated to 1.8 to accommodate fi_fabric2() API introduced in #10279

[shefty]

@j-xiong

This change indicates that the fi_fabric2() call is not aligned with the documentation in this file. Checking the code, it's using DEFAULT_SYMVER(... FABRIC_1.8) directly instead of CURRENT_SYMVER(). There were also changes to fi_getinfo / fi_freeinfo / fi_dupinfo as part of ABI 1.8 changes. The changes to those functions should be captured in the man page below as well.

If CURRENT_SYMVER() will no longer be used, that macro should be removed and the man page updated to reflect direct use of DEFAULT_SYMVER instead.

[shijin-aws]

@shefty @j-xiong If we are going to implement changes to fi_info today. Is it better to make it part of FABRIC_1.8 (since 2.0 is not released yet?), or we need to bump it as FABRIC_1.9?

[j-xiong]

We will keep it 1.8 for the 2.0 release.

[j-xiong]

@shefty Using DEFAULT_SYMVER() here for the new function instead of CURRENT_SYMVER() has the advantage of showing the exact ABI version at the definition and not needing to change it again when the ABI version is bumped. I think we can remove CURRENT_SYMVER() definition and usage info from the header. If no objection, I will make that change in a separate PR.

[shefty]

I think it's fine to remove CURRENT_SYMVER

[j-xiong]

Intel CI error is unrelated.