Remove posixAccount from samdb.py

[Rowland Penny]

On 17/01/16 23:35, github at samba.org wrote:
> New comment by abartlet on Samba Github repository
>
> https://github.com/samba-team/samba/pull/46#issuecomment-172395619
> Comment:
> Please just have one patch topic per pull request, the SOA records are a different, more complex matter.
>
>
And there we have another reason for me to stop using github, they were 
different commits, yet Andrew seems to have linked them somehow ?

Rowland