combo-layer: introduce ability to exclude component from mass update

There is no ability at the moment for situations where users would like
to keep section in combo-layer.conf but don't update it, unless explicitly
specified.

Now, by adding "update = no" to desired section would exclude
that repository from "combo-layer update" command.

It is still possible to explicitly update it by "combo-layer update $section".

By default, all repositories are assumed as "update = yes"

(From OE-Core rev: 74ecf1a0e5c8230e55cb1a309f711d98fa63ce79)

Signed-off-by: Alexander D. Kanevskiy <kad@kad.name>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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