Joshua s brown http communicator 2

[JoshuaSBrown]

Description

This pr is the first steps in a code refactor. The point of the refactor is to remove redundant HTTPS communication implementations throughout the code and standardize the HTTPS requests and responses with the interface currently used by ZeroMQ. This PR does not address HTTPS, it addresses HTTP communication traffic and has set up the foundation for adding HTTPS support. The HTTP communication is implemented in a standardized way using the "common" library which is used throughout datafed.

• Added Classes:
  -HTTP Communicator
  -HTTP Credentials
  -HTTP Socket
  -StringMessage
  -CredentialsTest

• Changes:
  -CMakeLists within common folder (Implemented Curl and SSL libraries)
  -IMessage header (Implemented Endpoint, Verb, Body to Message Attributes)
  -Util classes (Implemented functions for parsing messages for HTTP Communications)
  -CommunicatorFactory classes (Handles creation of HTTPCommunicator)
  -CredentialFactory classes (Handles creation of HTTPCredentials)
  -MessageFactory classes (Handles creation of StringMessage)
  -SocketFactory classes (Handles creation of HTTPSocket)
  -CMakeLists in unit tests (Starts/Stops flask server for http testing)

• My tests within CommunicatorFactory:
  -Factory Creation
  -Message send/recieve

• My tests within MessageFactory:
  -StringMessage Creation
  -MsgFactory Creation

• My tests within CredentialsFactory:
  -HTTPCredentials Creation

• What is needed for future development:
  -Implement HTTPS and Replace uses of curl commands within the application with centralized method.

• Why it's needed:
  -Building blocks for HTTPS
  -Centralizing communications between Globus and Datafed

[JoshuaSBrown]

@par-hermes format