Use decorator for opennes check

[lndbrg]

No description provided.

[coveralls]

Coverage increased (+0.1%) when pulling ff28a7d on lndbrg:use-decorator-for-opennes-check into 991d56b on paramiko:master.

[lndbrg]

This is neither a bug or a feature, but rather a clean up.

[coveralls]

Coverage increased (+0.14%) when pulling 4cc6d55 on lndbrg:use-decorator-for-opennes-check into 991d56b on paramiko:master.

[lndbrg]

LOLeralls reporting test LOLerage.

[lndbrg]

Ehh. I screwed up this request, based it off the wrong branch. Will re-push.

Re-pushed.

[coveralls]

Coverage increased (+0.05%) when pulling dc63250 on lndbrg:use-decorator-for-opennes-check into e941d56 on paramiko:master.