added a HTML id to the operating system ui tab

similar to the id we have in the host and hostgroup forms,
this change makes the ui plugin code look clean.

(cherry picked from commit 13923d499d1cc68a9e8f35734bf2e973c712784e)
fixes #2872 - default password not listed in debug script

(cherry picked from commit 6e6f246cf315c9c109e65d173db4012809b738cc)
Release 1.2.1