DLPX-82230 add delphix/fio to linux-pkg

[sumedhbala-delphix]

Need to build delphix maintained fio which runs on python3. This adds delphix/fio to linux-pkg
Testing:
ab-pre-push: http://selfservice.jenkins.delphix.com/job/appliance-build-orchestrator-pre-push/2924/ (upgrade hit a known bug)
Verified this change adds the fio build job to jenkins: http://selfservice.jenkins-sbala.dcol2.delphix.com/job/linux-pkg/job/master/job/build-package/job/fio/

[prakashsurya]

LGTM.. IIRC, we need to land this in a few sequential steps, if we want to avoid build failures..

1. land config.sh changes ..
2. build package via Jenkins job
3. land main.pkgs changes..

so we'll need separate PRs for (1) and (3).. otherwise, we'll get build failures due to (3) landing before (2) is completed (and we can't do (2), until (1) is landed)..

or we just land this as-is, and ignore any build failures that may occur until the package is built.. I'm fine either way..

[sumedhbala-delphix]

LGTM.. IIRC, we need to land this in a few sequential steps, if we want to avoid build failures..

1. land config.sh changes ..
2. build package via Jenkins job
3. land main.pkgs changes..

so we'll need separate PRs for (1) and (3).. otherwise, we'll get build failures due to (3) landing before (2) is completed (and we can't do (2), until (1) is landed)..

or we just land this as-is, and ignore any build failures that may occur until the package is built.. I'm fine either way..

I can monitor the build and rebuild after the first failure.