Rename some build rules to meet expectation in JGit bazel build

This is a preparation to link JGit as a submodule instead of an
external Maven build dependency.

Change-Id: Icd470c32b6b0447b480bc494ea5ebf558c24e34c

lib/BUILD

diff --git a/lib/BUILD b/lib/BUILD
index a6f026f..282643d 100644
--- a/lib/BUILD
+++ b/lib/BUILD
@@ -18,7 +18,7 @@
     "html-types",
     "jsr305",
     "servlet-api_2_5",
-    "servlet-api_3_1",
+    "servlet-api",
     "gson",
     "guava",
     "guava-failureaccess",
@@ -29,3 +29,16 @@
     "ow2-asm-tree",
     "ow2-asm-util",
 ]]
+
+java_library(
+    name = "slf4j-api",
+    exports = ["@log-api//jar"],
+)
+
+java_library(
+    name = "slf4j-simple",
+    runtime_deps = [
+        ":slf4j-api",
+        "@slf4j-simple//jar",
+    ],
+)