Make solarispkg work with multi-pkg for pkg.latest
Make solarispkg work with multi-pkg for pkg.latest

Currently solarispkg doesn't support repositories for pkgadd, so these
changes won't really allow pkg.latest to work as intended. This commit
does however bring this module in line with the changes being made in
other providers for #2906.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt