UI doesn't allow editing of auth methods

[geek65535]

Describe the bug
New authentication methods cannot be properly edited once created.

To Reproduce
Steps to reproduce the behavior:

1. Enable a new authentication method (eg LDAP).
2. Enter details (eg under sections 'LDAP Options', 'Customize User Search', etc).
3. Click 'Enable Method'
4. Edit Auth Method.
5. Only 'Method Options' is available.

Expected behavior
To get the same options as when auth method was enabled. If the values of the stored fields cannot be retrieved, then the fields should be displayed with the contents of '' or similar.

Environment:
version 0.10.1 on Linux x86_64

Vault server configuration file(s):
n/a (running in dev mode)