Dissolve top level gitiles-* directories

The current layout of having gitiles-* directories with separate java
source trees dates back to the bad era of Maven, when this specific
layout was necessary to decompose the build into separate pom.xml files.

Moreover, src/{main,test}/java are also Maven artifacts, so that we go
even further and create three top level directories:

* java
* javatests
* resources

Change-Id: I4421096428db1e3de019a9b6c1253217cf7e4fbe

tools/maven/BUILD

diff --git a/tools/maven/BUILD b/tools/maven/BUILD
index 5efc003..b2d424a 100644
--- a/tools/maven/BUILD
+++ b/tools/maven/BUILD
@@ -3,17 +3,17 @@
 
 maven_package(
     src = {
-        "blame-cache": "//blame-cache:libblame-cache-src.jar",
-        "gitiles-servlet": "//gitiles-servlet:libservlet-src.jar",
+        "blame-cache": "//java/com/google/gitiles:libblame-cache-src.jar",
+        "gitiles-servlet": "//java/com/google/gitiles:libservlet-src.jar",
     },
     doc = {
-        "blame-cache": "//blame-cache:javadoc",
-        "gitiles-servlet": "//gitiles-servlet:javadoc",
+        "blame-cache": "//java/com/google/gitiles:blame-cache-javadoc",
+        "gitiles-servlet": "//java/com/google/gitiles:servlet-javadoc",
     },
     group = "com.google.gitiles",
     jar = {
-        "blame-cache": "//blame-cache:blame-cache",
-        "gitiles-servlet": "//gitiles-servlet:servlet",
+        "blame-cache": "//java/com/google/gitiles:blame-cache",
+        "gitiles-servlet": "//java/com/google/gitiles:servlet",
     },
     repository = "gerrit-maven-repository",
     url = "gs://gerrit-maven",