Add test farm tests requirements file (#7061)

* Add requirements.txt.

* update readme

tests/letstest/README.md

@@ -14,25 +14,28 @@ Simple AWS testfarm scripts for certbot client testing
   - AWS EC2 has a default limit of 20 t2/t1 instances, if more
     are needed, they need to be requested via online webform.
 
-## Usage
-  - To install the necessary dependencies on Ubuntu 16.04, run:
+## Installation and configuration
+These tests require Python 2.7, awscli, boto3, PyYAML, and fabric<2.0. If you
+have Python 2.7 and virtualenv installed, you can use requirements.txt to
+create a virtual environment with a known set of dependencies by running:
 ```
-sudo apt install awscli python-yaml python-boto3 fabric
+virtualenv --python $(command -v python2.7 || command -v python2 || command -v python) venv
+. ./venv/bin/activate
+pip install --requirement requirements.txt
 ```
 
-  - Requires AWS IAM secrets to be set up with aws cli
-  - Requires an AWS associated keyfile <keyname>.pem
-
+You can then configure AWS credentials and create a key by running:
 ```
 >aws configure --profile <profile name>
 [interactive: enter secrets for IAM role]
 >aws ec2 create-key-pair --profile <profile name> --key-name <key name> --query 'KeyMaterial' --output text > whatever/path/you/want.pem
 ```
 Note: whatever you pick for `<key name>` will be shown to other users with AWS access.
 
-When prompted for a default region name, enter: `us-east-1`
+When prompted for a default region name, enter: `us-east-1`.
 
-then:
+## Usage
+To run tests, activate the virtual environment you created above and run:
 ```
 >python multitester.py targets.yaml /path/to/your/key.pem <profile name> scripts/<test to run>
 ```

tests/letstest/requirements.txt

@@ -0,0 +1,25 @@
+asn1crypto==0.24.0
+awscli==1.16.157
+bcrypt==3.1.6
+boto3==1.9.146
+botocore==1.12.147
+cffi==1.12.3
+colorama==0.3.9
+cryptography==2.4.2
+docutils==0.14
+enum34==1.1.6
+Fabric==1.14.1
+futures==3.2.0
+idna==2.8
+ipaddress==1.0.22
+jmespath==0.9.4
+paramiko==2.4.2
+pyasn1==0.4.5
+pycparser==2.19
+PyNaCl==1.3.0
+python-dateutil==2.8.0
+PyYAML==3.10
+rsa==3.4.2
+s3transfer==0.2.0
+six==1.12.0
+urllib3==1.24.3