Extra cleanup for ps module

Removing the remaining dictionary from the ps module and bringing it into line with returning a list of objects.

Signed-off-by: Jake Hunsaker <jhunsake@redhat.com>
Adding excludes list for filtering certain mountpoints

Added an excludes list ( self.excludes in __init__() ) to filter getFsMounts() against. Put this in init() in case it comes in handy elsewhere later.

Also made minor formatting changes to not mess with alignment when FS sizes are over 1TB.

Signed-off-by: Jake Hunsaker <jhunsake@redhat.com>