add wsa (wikistats admin) basic shell script

this script tries to emulate some features of the
old (and horrible) 'wikistats admin' aka. WSA script
that ran unpuppetized on volunteer servers in the past

it lets users add/del/mod wikis in the wikistats table
if they have a shell on the labs instance this runs on

Change-Id: I9f876c0f2c78a95c0fbece32ea98993348289b4d
Merge "add wsa (wikistats admin) basic shell script"