Remove hardcoded paths with {{ slspath }} variable

[aboe76]

Please test this, it works on 2015.5.x but {{ slspath }} isn't available on 2014.1 and below,

see also this issue : saltstack/salt#4348

[aneeshusa]

Heads up, apparently slspath is not recommended and we should be using tpldir instead; see further discussion in the issue linked above.

[puneetk]

Sounds good @aneeshusa , whenever the issue saltstack/salt#4348 is released, send over a pull request with the change to tpldir, and updated documentation to reflect that the formula is now 2015 only.

[iggy]

Despite what Rallytime says in that bug report, SaltStack appears to still be doing 2014.7 releases (the last one was less than a month ago). I think it won't kill us to keep support for $current-1 releases.

[aneeshusa]

@iggy, that's why I asked, and I feel the same way: $current-1 still seems to be somewhat supported, regardless of what they say. (Also, I don't know about the enterprise support options, but having 0 overlap in support windows when a new version comes out seems strange to me.)

slspath is supported in 2014.7 and up, but tpldir is only available in 2015.5 and up, so I think we may want to close this out and open a new issue up to switch to tpldir when 2015.5 becomes $current-1.