(#11004) Fix regex for pkg provider line matching

The pkg provider uses the output of pkg list to check if a package is
present on the system. On solaris 10 the output showed a dedicated
status field to reflect installed or known. On Solaris 11 this
field is not present anymore, so it was marked as an optional field in
the regex that is used to parse the pkg list output. The field
delimiter (\s+) however were notaround not marked as optional so while

library/python-2/pycurl-26 7.19.0.1-0.175.0.0.0.2.537  i--

worked

library/python-2/pycurl-26 7.19.0.1-0.175.0.0.0.2.537 i--

did not (notice there is only one whitespace between version an flags).

Modify the regex so the second example is also interpreted correctly.