doc: update glossary, remove from wiki

Promote a glossary.rst up into the doc/ folder, merge wiki
glossary entries (and remove from the wiki), and format use
the .. glossary directive to allow references by using the
:term: role (using :term:`ISR` will make a link to the
glossary entry for ISR)

Jira: ZEP-1321

Change-Id: Ie1461037ab456371604594488f01df9f21284561
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
(cherry picked from commit d73d3aa9)