qemuqmpclient: Support qemu 5.x+

pc.ram key is used for the initial memory, and it can't be removed.
3 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

failed SlapOS.Eggs.UnitTest-Master.Python3

00:18:45

passed SlapOS.Eggs.UnitTest-Master.Python2

00:11:26