Host swact failed. Active controller host did not change

Brief Description
-----------------
Connect system with floating IP, Run host-swact on active controller. After active controller disconnected and reconnected, the active controller is not changed.

Severity
--------
Major

Steps to Reproduce
------------------
host-swact

Expected Behaviour
------------------
active controller is changed

Actual Behaviour
----------------
no change

Reproducibility
---------------
Reproducible
4/10

System Configuration
--------------------
Dedicated storage

Branch/Pull Time/Commit
-----------------------
Master of 2019-01-15_20-18-00

Timestamp/Logs
--------------
[2019-01-16 09:09:22,480] 263 DEBUG MainThread ssh.send :: Send 'system --os-username 'admin' --os-password 'Li69nux*' --os-project-name admin --os-auth-url http://192.168.204.2:5000/v3 --os-user-domain-name Default --os-project-domain-name Default --os-endpoint-type internalURL --os-region-name RegionOne host-swact controller-1'
[2019-01-16 09:09:25,818] 388 DEBUG MainThread ssh.expect :: Output:
+---------------------+-----------------------------------------------------------------+
| Property | Value |
+---------------------+-----------------------------------------------------------------+
| action | none |
| administrative | unlocked |
| availability | available |
| bm_ip | None |
| bm_type | None |
| bm_username | |
| boot_device | /dev/disk/by-path/pci-0000:03:00.0-sas-0x5001e67cd7837001-lun-0 |
| capabilities | {u'stor_function': u'monitor'} |
| config_applied | 145bdb65-b815-4568-9126-5d7ead542cae |
| config_status | None |
| config_target | 145bdb65-b815-4568-9126-5d7ead542cae |
| console | ttyS0,115200 |
| created_at | 2019-01-16T06:44:30.414178+00:00 |
| hostname | controller-1 |
| id | 2 |
| install_output | text |
| install_state | completed |
| install_state_info | None |
| invprovision | provisioned |
| location | {} |
| mgmt_ip | 192.168.204.4 |
| mgmt_mac | 90:e2:ba:a3:9c:38 |
| operational | enabled |
| personality | controller |
| reserved | False |
| rootfs_device | /dev/disk/by-path/pci-0000:03:00.0-sas-0x5001e67cd7837001-lun-0 |
| serialid | None |
| software_load | 19.01 |
| task | Swacting |
| tboot | false |
| ttys_dcd | None |
| updated_at | 2019-01-16T09:09:05.990110+00:00 |
| uptime | 1688 |
| uuid | 0344ba4a-5af3-4f6d-904f-b428d3590c38 |
| vim_progress_status | services-enabled |
+---------------------+-----------------------------------------------------------------+
controller-1:~$
[2019-01-16 09:09:25,819] 263 DEBUG MainThread ssh.send :: Send 'echo $?'
[2019-01-16 09:09:25,922] 388 DEBUG MainThread ssh.expect :: Output:
0
controller-1:~$
[2019-01-16 09:09:25,922] 1337 DEBUG MainThread ssh.get_active_controller:: Getting active controller client for pv0
[2019-01-16 09:09:25,922] 263 DEBUG MainThread ssh.send :: Send ''
[2019-01-16 09:09:26,025] 388 DEBUG MainThread ssh.expect :: Output:
controller-1:~$
[2019-01-16 09:09:31,030] 263 DEBUG MainThread ssh.send :: Send ''
[2019-01-16 09:09:31,133] 388 DEBUG MainThread ssh.expect :: Output:
controller-1:~$
[2019-01-16 09:09:36,138] 263 DEBUG MainThread ssh.send :: Send ''
[2019-01-16 09:09:39,243] 1331 INFO MainThread host_helper.wait_for_swact_complete:: ssh to 128.224.150.73 disconnected, indicating swacting initiated.
[2019-01-16 09:10:09,265] 134 INFO MainThread ssh.connect :: Attempt to connect to host - 128.224.150.73
[2019-01-16 09:10:25,794] 263 DEBUG MainThread ssh.send :: Send ''
[2019-01-16 09:10:25,896] 388 DEBUG MainThread ssh.expect :: Output:
controller-1:~$
[2019-01-16 09:10:25,897] 162 INFO MainThread ssh.connect :: Login successful!
[2019-01-16 09:10:25,897] 263 DEBUG MainThread ssh.send :: Send ''
[2019-01-16 09:10:25,998] 388 DEBUG MainThread ssh.expect :: Output:
controller-1:~$
[2019-01-16 09:10:25,999] 388 DEBUG MainThread ssh.expect :: Output:

[2019-01-16 09:10:45,610] 263 DEBUG MainThread ssh.send :: Send 'system --os-username 'admin' --os-password 'Li69nux*' --os-project-name admin --os-auth-url http://192.168.204.2:5000/v3 --os-user-domain-name Default --os-project-domain-name Default --os-endpoint-type internalURL --os-region-name RegionOne servicegroup-list'
[2019-01-16 09:10:47,937] 388 DEBUG MainThread ssh.expect :: Output:
+--------------------------------------+-----------------------------+--------------+-----------------+
| uuid | service_group_name | hostname | state |
+--------------------------------------+-----------------------------+--------------+-----------------+
| b3f31ab2-e34f-449a-804c-a60f5cb64c55 | cloud-services | controller-1 | active |
| 8422fcb0-cd46-4fe5-b847-9542addfa5df | cloud-services | controller-0 | standby |
| a3fd2f7a-e4fc-4a16-8325-7fa7547f7a5b | controller-services | controller-1 | active-degraded |
| b1b225eb-3751-4274-94e9-ec28cc4b8945 | controller-services | controller-0 | standby |