Fix $nginx_version.  Placing an array, even with a position, in quotes results in very unexpected behavior.

a block in this manifest will figure out the nginx version based on the $pkg_version through splitting on the '-' in the $pkg_version.  Quoting alters the output.  ex.

"$split_ver[0]" = 1.0.153hs4[0]
$split_ver[0] = 1.0.15