Improve HTTP response file behavior

[alexjhawk]

Improve the HTTP response file behavior by including a unique number or value in the name. This prevents the possibility of simultaneous requests overlapping and causing file access errors such as

32603  httpc-http request error
21317  eftp-Write operation is already in progress. New (/usr/responses/dataMessageResponse.json)

Additionally, the cleanup/deletion of response files is inconsistent and should be improved so all temporary response files are deleted once parsed/processed.

[alexjhawk]

The implementation of improved functionality should be relatively straightforward, as response contents are already read/returned by the SCHttpUtility class methods.

The SCHttpUtility class also includes automatic functionality to create and delete temporary, unique response files when using the httpGet and httpPost method overloads without a specified file name.

• See https://github.com/hms-networks/sc-ewon-flexy-extensions-lib/blob/5a9c6eb65e17c538b1fd9bf946027d510eee4cd5/src/main/java/com/hms_networks/americas/sc/extensions/system/http/SCHttpUtility.java#L190 and https://github.com/hms-networks/sc-ewon-flexy-extensions-lib/blob/5a9c6eb65e17c538b1fd9bf946027d510eee4cd5/src/main/java/com/hms_networks/americas/sc/extensions/system/http/SCHttpUtility.java#L241

The TWApiManager class in the Thingworx Connector may serve as an example implementation of the intended new usage: https://github.com/hms-networks/flexy-thingworx-connector/blob/d04a82bb7ca0402e5c5f14aabea3cd28a938439c/src/main/java/com/hms_networks/americas/sc/thingworx/data/TWApiManager.java#L148.