Terraform configurations for creating test infrastructure (#185)

This change includes Terraform configurations for creating and destroying compute resources for testing on AWS and Azure. The configurations install ZooKeeper, Hadoop, Accumulo, and Accumulo-Testing. Users can supply options for the versions of the software that should be installed or can supply their own binary tarballs for installation. See the README for detailed documentation.


Co-authored-by: Brian Loss <brianloss@gmail.com>
Co-authored-by: domgarguilo <dominic.garguilo@gmail.com>

contrib/terraform-testing-infrastructure/.gitignore

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+**/.terraform.lock.hcl
+**/.terraform/
+conf/
+**/terraform.tfstate
+**/terraform.tfstate.backup
+**/*.auto.tfvars.json
+**/*.auto.tfvars

contrib/terraform-testing-infrastructure/QUICKSTART

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+#
+# 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.
+#
+
+1. Download and Install Terraform
+
+  wget https://releases.hashicorp.com/terraform/1.1.5/terraform_1.1.5_linux_amd64.zip
+  unzip into /usr/local/bin
+
+2. Create the Shared State
+
+  NOTE: You only need to do this once. If you are sharing the cluster with a team,
+        then only one person needs to do it and they need to share the bucket with
+        the other team members.
+
+  cd shared_state/aws
+  terraform init
+  terraform apply
+
+3. Create the Configuration
+
+  You will need to create a configuration file that includes values for the
+  variables that do not have a default value. See the Variables section in
+  the README. For example, you can create a file "aws.auto.tfvars" file in
+  the aws directory with the following content (replace as appropriate):
+
+create_route53_records = "true"
+private_network = "true"
+accumulo_root_password = "secret"
+security_group = "sg-ABCDEF001"
+route53_zone = "some.domain.com"
+us_east_1b_subnet = "subnet-ABCDEF123"
+us_east_1e_subnet = "subnet-ABCDEF124"
+ami_owner = "000000000001"
+ami_name_pattern = "MY_AMI_*"
+authorized_ssh_keys = [
+  "ssh-rsa .... user1",
+  "ssh-rsa .... user2",
+  "ssh-rsa .... user3"
+]
+
+
+3. Create the Resources
+
+  cd aws
+
+  Create the configuration section of the README. For example you can create
+    Example in HCL syntax:
+
+  terraform init --backend-config=bucket=<bucket-name-goes-here>
+  terraform apply
+
+4. Accessing the cluster
+
+  The output of the apply step above will include the IP addresses of the
+  resources that were created. If created correctly, you should be able to
+  ssh to the nodes using "ssh hadoop@ip". If you created DNS addresses for
+  the nodes, then you should be able to ssh using those addresses also. You
+  should also be able to access the web pages (see the "Accessing Web
+  Pages" section of the README for ports)
+