Move http::HttpThreadPool to asiolink::IoServiceThreadPool

This issue fulfills tasks 2.1 a Bulk Lease Query Design, It moves http::HttpThreadPool to asiolink::IoServiceThreadPool

2. LeaseQueryListener
    2.1 Create the initial class hierarchy from CmdHttpListener hierarchy
       a. HttpThreadPool -> IoServiceThreadPool, this class could probably be in asiolink, there
       really is nothing in it that is HTTP or even TCP specific.  It's really a pool of IOService
       driven threads.
"

Edited Oct 03, 2022 by Thomas Markwalder

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information