Current code mistakenly thinks that 3.40 is older than 3.27, because
it's treating 3.40 as 3.4, thus returning the wrong maximum supported
version by both server and client.
It is also returning a 3.40 version as 3.4 because it's returning it as
a float.
This patch fixes both issues by not using float conversion but using the
APIVersion object to do the comparison and by changing returned type to
a string so it can be used to instantiate a client.
Change-Id: Ica4d718b3de31c31da047f07c5154b242e122596
Closes-Bug: #1705093
52cc5c6cb3