CLOUDSTACK-9334: Support jenv and pyenv to manage Java and Python versions

* Adds .java-version to specify Java 1.7 as the JDK version to use
    for CloudStack development.
  * Adds .python-vresion to specify Python 2.7.11 as the Python to
    use for CloudStack development.
  * Adds requirements.txt to specify the default dependencies used
    for CloudStack development.  It does not include Marvin's
    dependencies because it's bundle already defines the dependencies
    which are installed with Marvin.
  * Adds .java-version and .python-version to the RAT excludes
    because neither jenv or pyenv support comments in these files
  * Updates INSTALL.md to explain how to utilize jenv and pyenv for
    CloudStack development

.java-version

@@ -0,0 +1 @@
+1.7

.python-version

@@ -0,0 +1 @@
+cloudstack

INSTALL.md

@@ -38,6 +38,23 @@ Start the MySQL service:
 
     $ service mysqld start
 
+### Using jenv and/or pyenv for Version Management
+
+CloudStack is built using Java and Python.  To make selection of these tools versions more consistent and ease installation for developers, optional support for [jenv](http://www.jenv.be/) and [pyenv](https://github.com/yyuu/pyenv) with [virtualenv]|(https://github.com/yyuu/pyenv-virtualenv) is provided.  jenv installation instructions are available here and pyenv installation instructions are available here.  For users of [oh-my-zsh](http://ohmyz.sh/) there is a pyenv plugin available to trigger configuration of pyenv in a shell session.
+
+Following installation, execute the following commands to configure jenv and pyenv for use with CloudStack development:
+
+'''
+  # pyenv install 2.7.11                                          # Install Python 2.7.11
+  # pyenv virtualenv 2.7.11 cloudstack                            # Create a cloidstack virtualenv using Python 2.7.11
+  # pip install -r <root CloudStack source tree>/requirements.txt # Install cloudstack Python dependencies
+  # jenv add <path to JDK 1.7 installation>                       # Add Java7 to jenv
+'''
+
+*N.B.* If you are running Linux, you may need to install additional packages to allow pyenv to build Python.
+
+Following these steps, jenv and pyenv will use .java-version and .python-version files in the root of the CloudStack source tree to switch to the correct Java version and the cloudstack Python virtualenv for CloudStack development.
+
 ## Getting the Source Code
 
 You may get the source code from the repository hosted on Apache:

pom.xml

@@ -756,6 +756,8 @@
               <exclude>CONTRIBUTING.md</exclude>
               <exclude>tools/docker/Dockerfile</exclude>
               <exclude>tools/docker/supervisord.conf</exclude>
+              <exclude>.java-version</exclude>
+              <exclude>.python-version</exclude>
               <exclude>.idea/</exclude>
               <exclude>**/*.log</exclude>
               <exclude>**/*.patch</exclude>

requirements.txt

@@ -0,0 +1,21 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# Install the latest version of cloudmonkey
+cloudmonkey
+
+# Marvin dependencies are installed via its bundle