qemu.tests.balloon_check: Separate enlarge and evict cases

Update the related new parameters and separated the enlarge and evict
cases
Signed-off-by: NYiqiao Pu <ypu@redhat.com>

qemu/tests/cfg/balloon_check.cfg

 - balloon_check: install setup image_copy unattended_install.cdrom
+    virt_test_type = qemu
     no Win2000, Fedora.8, Fedora.9, Fedora.10, RHEL.3, RHEL.4, Unix, livecd
     type = balloon_check
     extra_params += " -balloon virtio"
@@ -9,20 +10,11 @@
     Windows:
         ratio = 0.5
     variants:
-       - @base:
+       - balloon_base:
 
        - balloon-migrate:
            sub_balloon_test_enlarge = "migration"
            sub_balloon_test_evict = "migration"
-           migration_test_command = help
-           migration_bg_command = "cd /tmp; nohup tcpdump -q -i any -t ip host localhost"
-           migration_bg_check_command = pgrep tcpdump
-           migration_bg_kill_command = pkill tcpdump
-           kill_vm_on_error = yes
-           iterations = 2
-           used_mem = 1024
-           mig_timeout = 3600
-           migration_protocol = "tcp"
        - guest_s3:
            extra_params += " -global PIIX4_PM.disable_s3=0"
            sub_balloon_test_enlarge = "guest_suspend"
@@ -39,17 +31,32 @@
            guest_suspend_type = "disk"
            services_up_timeout = 30
            qemu_quit_after_sub_case = yes
+           session_need_update = yes
            # params: s3_support_chk_cmd, s3_bg_program_setup_cmd,
            # s3_bg_program_chk_cmd, s3_bg_program_kill_cmd, s3_log_chk_cmd,
            # s3_start_cmd and services_up_timeout are set in guest-os.cfg
-       - balloon-shutdown_enlarge:
-           sub_balloon_test_enlarge = "shutdown"
-           shutdown_method = shell
-           kill_vm = yes
-           kill_vm_gracefully = no
-           check_img = yes
-       - balloon-shutdown_evict:
-           shutdown_method = shell
-           kill_vm = yes
-           kill_vm_gracefully = no
-           sub_balloon_test_evict = "shutdown"
+        - balloon-reboot:
+            sub_balloon_test_enlarge = "boot"
+            sub_balloon_test_evict = "boot"
+            reboot_method = shell
+            kill_vm_on_error = yes
+            reboot = yes
+            session_need_update = yes
+        - balloon-shutdown:
+            sub_balloon_test_enlarge = "shutdown"
+            sub_balloon_test_evict = "shutdown"
+            shutdown_method = shell
+            kill_vm = yes
+            kill_vm_gracefully = no
+            check_img = yes
+    variants:
+        - balloon_evict:
+            # Disable balloon_base case as it not run any sub test
+            no balloon_base
+            run_evict_sub_test = yes
+        - balloon_enlarge:
+            # Disable balloon_base case as it not run any sub test
+            no balloon_base
+            run_enlarge_sub_test = yes
+        - balloon_evict_and_enlarge:
+            only balloon_base