Merge branch 'stable-2.15' into stable-2.16

* stable-2.15:
  ElasticContainer: Test with versions 5.6.13 and 6.4.3
  Upgrade elasticsearch-rest-client to 6.4.3
  Bazel: Consume versions directly from lib:versions.bzl in skylib
  AbstractChangeNotes: Never open repo when NoteDb is off
  dev-contributing: Specify buildifier version 0.17.2
  Remove unused dependency on httpcomponents:httpmime
  Fix Elasticsearch dependency on httpcore-nio
  Upgrade Jetty to 9.3.24.v20180605 to fix several CVEs
  [CVE-2018-1000180, CVE-2018-1000613] Upgrade Bouncycastle to 1.60
  Adapt PublicKeyStoreTest to work with BouncyCastle 1.60
  [CVE-2018-10237]: Upgrade guava to 24.1.1-jre
  Stop using CharMatcher.javaLetterOrDigit
  project/Index: Assign and ignore unused future
  [CVE-2017-12629] Upgrade Lucene to 5.5.5
  [CVE-2018-10936] Upgrade postgresql to 42.2.5
  [CVE-2015-1832] Upgrade Apache Derby to 10.12.1.1
  Set version to 2.14.17-SNAPSHOT

Change-Id: I9501df6224b9754bd489eb4f03c4741a09f9fd16

lib/httpcomponents/BUILD

@@ -27,21 +27,16 @@ java_library(
     exports = ["@httpcore//jar"],
 )
 
-java_library(
-    name = "httpmime",
-    data = ["//lib:LICENSE-Apache2.0"],
-    visibility = ["//visibility:public"],
-    exports = ["@httpmime//jar"],
-)
-
 java_library(
     name = "httpasyncclient",
     data = ["//lib:LICENSE-Apache2.0"],
+    visibility = ["//java/com/google/gerrit/elasticsearch:__pkg__"],
     exports = ["@httpasyncclient//jar"],
 )
 
 java_library(
     name = "httpcore-nio",
     data = ["//lib:LICENSE-Apache2.0"],
+    visibility = ["//java/com/google/gerrit/elasticsearch:__pkg__"],
     exports = ["@httpcore-nio//jar"],
 )