XQH is missing get_header() method

[andrewkirillov-ibm]

Following dlq_browse.py sample application, I was doing similar, but browsing XMITQ, and so needed to get XQH header from the message.

For DLH we can make it simple by using its get_header() method.

dlh = mq.DLH().get_header(msg)

For XQH samilar does not work, as the class does not provide such method.

A workaround is to it do it this way instead:

xqh = ibmmq.XQH()
xqh.unpack(msg[:104])

[ibmmqmet]

PR was merged