add tags: section, ensure tags are always lowercase

Whenever --device-tags are passed, a "tags:" section is added to the
job with all of the tags passed on the command-line.

To facilitate this, the device_tags list is passed directly from
python to the jinja templates, and iteration is done in jinja
instead of a string created in python.

Also, while here, ensure that tags are always passed lower-cased.

IMPORTANT: this implies that any tags in LAVA labs that are upper-case
           will *never* be used.

Change-Id: I8f274098a69e34c32c5ed2d1c430eca0d364bcc5
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

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