Move appjar contents up one level to normalize our structure

In general we map one Maven project description to one Git
repository, as each Maven project has its own unique version
number for its artifact.

This change pulls everything up one level so its a much more
typical directory layout, where the pom.xml is at the root
of the directory structure.

Signed-off-by: Shawn O. Pearce <sop@google.com>

src/main/java/GerritServer.properties_example

@@ -0,0 +1,18 @@
+# Any properties starting with "database." will be fed to the JDBC driver,
+# after removing the "database." prefix.
+#
+# The following "special" properties are removed from that set:
+#
+#  database.driver :  Class name of the driver to load.
+#  database.url    :  The connection URL
+#
+
+# H2
+# database.driver = org.h2.Driver
+# database.url = jdbc:h2:file:ReviewDb
+
+# PostgreSQL
+# database.driver = org.postgresql.Driver
+# database.url = jdbc:postgresql:reviewdb
+# database.user = gerrit2
+# database.password = supersecretcode