clean up whitespace on stack.sh

Change-Id: If73435968cfbd0dd3cc519f0a30e02bec5fcb386
add support for heredoc folding of lines

this change in the parser allows for us to have heredocs folded
into logical lines.

Change-Id: I51ebe6cd7b89b5f7194e947896f20b6750e972e3
final bash8 files for the rest of devstack

With this devstack/master is bash8 clean, and ready for enforcement

Change-Id: I03fc89b401e6b7a23224d71472122c1bfa3ad0bd