Order of query_params in REST transport is unstable

[busunkim96]

See https://github.com/googleapis/python-compute/pull/3/files for an example.

gapic-generator-python/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2

Lines 181 to 184 in 56c31de

	query_params = {
	{%- for field in method.query_params %}
	'{{ field|camel_case }}': request.{{ field }},
	{%- endfor %}

I believe the sort_lines filter will stabilize the order.

gapic-generator-python/gapic/templates/%namespace/%name_%version/%sub/__init__.py.j2

Lines 10 to 15 in 517118c

	{% filter sort_lines -%}
	{% for service in api.services.values()|sort(attribute='name')
	if service.meta.address.subpackage == api.subpackage_view -%}
	from .services.{{ service.name|snake_case }} import {{ service.client_name }}
	{% endfor -%}
	{% endfilter -%}