Disable keep alive while shutting down

What does this MR do?

Currently while in the process of shutting down the Keep-Alive is still active. From the http#Server.SetKeepAlivesEnabled documentation page:

SetKeepAlivesEnabled controls whether HTTP keep-alives are enabled. By default, keep-alives are always enabled. Only very resource-constrained environments or servers in the process of shutting down should disable them.

Since this would be the process of shutting down we should set the keep-alive to false.

TODO

• I added the Changelog trailer (e.g. Changelog: added) to the commits that need to be included in the changelog
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines