v2.x: updated API oshmem examples to OSHMEM 1.3

[karasevb]

cherry picked from commit e894a89

[hppritcha]

This PR needs a reviewer

[jsquyres]

I do not see a corresponding commit on master.

All PRs to release branches must contain commits that exist on / are cherry-picked+ported from master.

[jsquyres]

Please update the commit message to include the commit hash of the corresponding commit on master. Thanks.

[jsquyres]

@karasevb If you could update the commit message to include the cherry-pick notice, that would be great. Thanks.

Git pro tip: If you git cherry-pick -x ... (i.e., use the -x option), it pre-seeds your commit message with a last line that looks like this:

(cherry picked from commit e894a89)

To fix the commit on this PR, you can just git commit --amend and manually put that line at the bottom of the message, and then git push --force to your branch (fixing up a PR like this is just about the only valid reason to force push). If you do that, the new commit+message will show up here on the PR.

[karasevb]

@jsquyres Please check.
Thank you for the tip!

[jsquyres]

@karasevb Perfect; thanks.

@hppritcha When CI finishes, this PR is good to go.