Made Monitor_dbcalls.read_vm_memory more efficient.
Made Monitor_dbcalls.read_vm_memory more efficient.

Signed-off-by: Rok Strniša <ef2e6fb7f9c4d68ca2b20c62606309353789e818@citrix.com>

johnelse/xcp-rrdd,koushikcgit/xcp-rrdd,koushikcgit/xcp-rrdd,simonjbeaumont/xcp-rrdd,djs55/xcp-networkd,djs55/squeezed,robhoes/squeezed,simonjbeaumont/xcp-rrdd,djs55/xcp-rrdd,koushikcgit/xcp-networkd,sharady/xcp-networkd,johnelse/xcp-rrdd,djs55/xcp-networkd,sharady/xcp-networkd,koushikcgit/xcp-rrdd,djs55/xcp-rrdd,koushikcgit/xcp-networkd