Refactored PI-ECMP app to use action profiles of basic.p4

Also removed obsolete ecmp.p4-related code.

Change-Id: Idaca90becfff5fc312de2530bf7924ccd502e076
diff --git a/pipelines/basic/src/main/resources/p4c-out/bmv2/basic.json b/pipelines/basic/src/main/resources/p4c-out/bmv2/basic.json
index a38b290..f1a65d1 100644
--- a/pipelines/basic/src/main/resources/p4c-out/bmv2/basic.json
+++ b/pipelines/basic/src/main/resources/p4c-out/bmv2/basic.json
@@ -13,8 +13,7 @@
         ["tmp_0", 32, false],
         ["local_metadata_t.l4_src_port", 16, false],
         ["local_metadata_t.l4_dst_port", 16, false],
-        ["local_metadata_t.next_hop_id", 16, false],
-        ["local_metadata_t.selector", 16, false]
+        ["local_metadata_t.next_hop_id", 16, false]
       ]
     },
     {