bitbake: sphinx: bitbake-user-manual: use builtin sphinx glossary

Sphinx has a glossary directive. From the documentation:
This directive must contain a reST definition list with terms and
definitions. The definitions will then be referencable with the 'term'
role.

So anywhere in *any* manual, we can do :term:`VAR` to refer to an item
from the glossary, and create a link.

An HTML anchor is created for each term in the glossary, and can be
accessed as:
<link>/ref-variables.html#term-<NAME>

To convert to a glossary, we needed proper indentation (e.g. added 3
spaces to each line)

(Bitbake rev: e8359fd85ce0358019e2a32b4c47ba76613f48f0)

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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