Add password_cipher_mode to encrypt password.

[zongzw]

@<reviewer_id>

What issues does this address?

Fixes #
WIP #
...

What's this change do?

Where should the reviewer start?

Any background context?

[zongzw]

User comments the os_password which make variable self.conf.os_password to be None.
Just post a new patch PR for them to consider this situation.

[zongzw]

Forget the conflict, this pr will NOT be merged eventually.
The fix to this case for master/9.8-stable will in another PR.

[zongzw]

Test cases:

os_password NOT commented:

(Pdb) l
379  	            resource_helper.ResourceType.pool)
380
381  	        if self.conf.password_cipher_mode:
382  	            self.conf.icontrol_password = \
383  	                base64.b64decode(self.conf.icontrol_password)
384 B->	            if self.conf.os_password:
385  	                self.conf.os_password = base64.b64decode(self.conf.os_password)
386
387  	        try:
388
389  	            # debug logging of service requests recieved by driver
(Pdb) p self.conf.os_password
'OTExNTNjODViOGRkNDE0Nw=='
(Pdb) p self.conf.icontrol_password
'admin'
(Pdb) n
> /usr/lib/python2.7/site-packages/f5_openstack_agent/lbaasv2/drivers/bigip/icontrol_driver.py(385)__init__()
-> self.conf.os_password = base64.b64decode(self.conf.os_password)
(Pdb) n
> /usr/lib/python2.7/site-packages/f5_openstack_agent/lbaasv2/drivers/bigip/icontrol_driver.py(387)__init__()
-> try:
(Pdb) p self.conf.os_password
'91153c85b8dd4147'

os_password commented:

-> if self.conf.os_password:
(Pdb) p self.conf.os_password
None
(Pdb) n
> /usr/lib/python2.7/site-packages/f5_openstack_agent/lbaasv2/drivers/bigip/icontrol_driver.py(387)__init__()
-> try:
(Pdb) p self.conf.os_password
None

[Niklaus-xie]

seems only for patch. won't merge this one. put a -2 here .