Local Transaction, BytesMessage and other enhancements

Wrap-up of changes since last release in October 2020;

New Features:

• Support for Put and Get under local transaction
• Support for BytesMessage
• Support for Application Name (ApplName)
• Application sample + Dockerfile for running in OpenShift
• Support for Asynchronous Put

Bug fix / minor enhancement:

• Update to MQ 9.2.1 client version
• Performance enhancement by using PUT1
• Make receive buffer size configurable
• Check for cascaded close
• Fix index out of range on CorrelationID

Update to mq-golang v5.1.2 for MQ 9.2 client

• Update to MQ 9.2 client and re-test
• Fix broken links in readme files

Update to mq-golang v5.0.0 for Go Modules

• Pick up mq-golang support for Go modules at v5.0.0
• Also brings in a pre-req for Golang v1.13

Switch to "go mod" for dependencies

Adopt "go mod" for dependency management.

First release - uses dep for dependencies

Includes support for;

• client connections to queue managers
• local bindings connections to queue managers
• anonymous TLS and mutual TLS connections to queue managers
• receiveNoWait and receive with wait
• text messages (only)
• persistent and non-persistent messages
• get by correlation ID
• request/reply messaging pattern
• expiring messages with time to live

Uses "dep" for dependency management.