restructure rcloud-base as a single base controller (#37)

* restructure rcloud-base as a single base controller
* updated master.rest
* moved sentry from internal to pkg as it is used by relay
* removing unused rpc and it's dependencies
* Fix usermgmt tests
* Don't redefine variables in rest file
Co-authored-by: Abin Simon <abin.simon@rafay.co>

server/testdata/query.sql

@@ -0,0 +1,19 @@
+CREATE OR REPLACE VIEW sentry_bootstrap_template_host AS
+SELECT
+    a.name,
+    (h::jsonb) -> 'host' AS host
+FROM (
+    SELECT
+        name,
+        jsonb_array_elements(
+            CASE jsonb_typeof(hosts)
+            WHEN 'array' THEN
+                hosts
+            ELSE
+                '[]'
+            END) AS h
+    FROM
+        sentry_bootstrap_agent_template) AS a
+WHERE
+    a.h ->> 'type' = 'HostTypeExternal';
+