[AETHER-443][AETHER-453] Improve tost-onos image builder

- The workspace is built from scratch (onos and apps)
- Apps are built using local version or pulled from mvn repos
- 'tost-onos' is a minimal onos image built using 'tost' profile
- 'tost' is an onos image buit on top of 'tost-onos' with the tost apps

Change-Id: Id8ac664d16e6eaade658ba5bc41de1359aae09c5
diff --git a/.gitignore b/.gitignore
index 773bd4c..690080d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,12 @@
 *.log
 patch.txt
-onos/
\ No newline at end of file
+.idea/
+local-apps/
+onos/
+trellis-control/
+trellis-t3/
+fabric-tofino/
+up4/
+kafka-onos/
+.m2/
+mvn_settings.xml