Bazel: Add fixes for --incompatible_load_java_rules_from_bzl

Change-Id: Ifc47ae22209fdb7a5d7bede4da002640ed26a43a
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.junit.ssh/BUILD

@@ -1,3 +1,5 @@
+load("@rules_java//java:defs.bzl", "java_library")
+
 package(default_visibility = ["//visibility:public"])
 
 java_library(

org.eclipse.jgit.ssh.apache/BUILD

@@ -1,3 +1,5 @@
+load("@rules_java//java:defs.bzl", "java_library")
+
 package(default_visibility = ["//visibility:public"])
 
 SRCS = glob(["src/**/*.java"])

tools/BUILD

@@ -1,3 +1,4 @@
+load("@rules_java//java:defs.bzl", "java_package_configuration")
 load(
     "@bazel_tools//tools/jdk:default_java_toolchain.bzl",
     "JDK9_JVM_OPTS",