The template is referenced relative to the script path and this could
results in errors in case script is run from root. Add explicit
path to the template file name.
Also, moving telemetry_var template to template dir.
And remove double quotes from around json dict.
signed-off-by: Tamer Ahmed <tamer.ahmed@microsoft.com>
sonic-cfggen call is slow and this is taking place in the SONiC
boot up process. The change uses templates to assemble all required
vars into single template file. With this change, telemetry now calls
once into sonic-cfggen.
signed-off-by: Tamer Ahmed <tamer.ahmed@microsoft.com>