Make formula relative to actual directory by using 'tpldir'

[mkotsbak]

No description provided.

[aboe76]

@noelmcloughlin thanks for reviewing, @mkotsbak thanks for this pr.

[noelmcloughlin]

Thanks guys. @mkotsbak thanks for the contribution.

Could you raise another PR to complete same changes for content in files/ directory:

ls
client.cnf		my-include.cnf		mysql-clients.cnf	usr-my.cnf
galera.cnf		my.cnf			server.cnf

Because these are not SLS files the 'tpldir' variable will be undefined, so you'll have to pass as context variable to each file.managed state - like this for example. Thanks

    context:
       tpldir: {{ tpldir }}

[mkotsbak]

Sure, nice workaround. Sent PR: #187