Add a YAML syntax checker for static device configs
Add a YAML syntax checker for static device configs

LAVA-1121 - Syntax checker to check a directory
of device dictionaries against a directory of device-type
jinja2 templates, reporting syntax or jinja errors.
The output is not validated against the LAVA device schema.

Change-Id: I9369cd7b9ce319741520712d89d048561e6c6ecc

Linaro/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server