test: machines: fix testDelete flake because of not reaching paused state

Wait for the VM to boot before attempting to suspend it, since pausing VMs
requires the cooperation of the guest OS, and will not succeed without
it.

test/verify/machineslib.py

@@ -890,7 +890,7 @@ class TestMachines(NetworkCase):
         name = "subVmTest1"
         img2 = "/var/lib/libvirt/images/{0}-2.img".format(name)
 
-        self.startVm(name, graphics='vnc')
+        args = self.startVm(name, graphics='vnc')
 
         self.login_and_go("/machines")
         b.wait_in_text("body", "Virtual Machines")
@@ -953,6 +953,11 @@ class TestMachines(NetworkCase):
         self.startVm(name)
 
         b.click("tbody tr[data-row-id=vm-{0}] th".format(name)) # click on the row header
+
+        # Make sure that the VM booted normally before attempting to suspend it
+        if args["logfile"] is not None:
+            wait(lambda: "Linux version" in self.machine.execute("cat {0}".format(args["logfile"])), delay=3)
+
         self.machine.execute("virsh -c qemu:///system suspend {0}".format(name))
         b.wait_in_text("#vm-{0}-state".format(name), "paused")
         b.click("#vm-{0}-delete".format(name))