extend Solaris ps output to include unrestricted command length and append zone info 

Commit contains these squashed commits:

commit 81f19834f5a8c889a3ca00e8054188253bc73c10
Author: Matthew Cattell <matthew.cattell@cfengine.com>
Date:   Fri Jun 20 00:43:27 2014 +0200

    make sure zone header shows and ensure zone name appended to end of line

commit de8518c7fb75582063a26bcc4d6c5160d6ede1ac
Author: Matthew Cattell <matthew.cattell@cfengine.com>
Date:   Fri Jun 20 00:31:26 2014 +0200

    add zones wrapper to get zone name

commit 8687a20ebd3750fff66c77e683b29138e1e60d10
Author: Matthew Cattell <matthew.cattell@cfengine.com>
Date:   Fri Jun 20 00:27:41 2014 +0200

    add zone column to end of ps output
You really don't need to cast `*sp` to int; and lots of parentheses here are superfluous.
`for (sp = buf + len - 1; sp > buf && isspace(*sp); sp--)`