add support for generic streams

templates/stream.conf.j2

@@ -0,0 +1,22 @@
+#jinja2:lstrip_blocks: True
+{% set stream = {}|combine(nginx_streams_defaults, item.value, recursive=True) %}
+{% set stream_name = item.key %}
+
+server {
+
+	{% for i in stream.listen.custom %}
+	listen {{ i }};
+	{% endfor %}
+
+	proxy_pass {{ stream.proxy_pass }};
+	proxy_protocol {{ stream.proxy_protocol }};
+
+	{% for c in stream.custom|default([]) %}
+	{{ c }};
+	{% endfor %}
+
+	{% for include in stream.includes %}
+	include {{ include }};
+	{% endfor %}
+
+}