Stop shipping core dependencies within plugin jar

As plugin(s) should not include dependencies provided by gerrit core.

This is a cherry-pick of the downstream commit ebbff943, which was not
integrated by the latest merge. However this is an adaptation that keeps
shipping the postgresql dependency, as that one is no longer included in
core.

Change-Id: Ib253b57929a39f66d951c3e875b83f53f08669f0

BUILD

diff --git a/BUILD b/BUILD
index 96de364..f311f16 100644
--- a/BUILD
+++ b/BUILD
@@ -8,13 +8,12 @@
 )
 
 CONDUCTOR_DEPS = [
-    "@dbcp//jar",
-    "@pool//jar",
     "@postgresql//jar",
 ]
 
 EXECUTOR_DEPS = CONDUCTOR_DEPS + [
     "@aopalliance//jar",
+    "@dbcp//jar",
     "@guava//jar",
     "@guava-failureaccess//jar",
     "@guice//jar",
@@ -25,6 +24,7 @@
     "@log4j-api//jar",
     "@log4j-core//jar",
     "@log4j-slf4j-impl//jar",
+    "@pool//jar",
     "@retry//jar",
     "@slf4j-api//jar",
     "@slf4j-ext//jar",