The temp directory packstack was using was being created in
an insecure manor with world readable permissions. This commit ensures
temp directories are created securly on both the local and remote
hosts
o Create var directory with tempfile.mkdtemp
o remove other places where var directory was created
o change permissions of all files that do (or may) contain
sensitive data to 600
o No longer append data to mainifest file, it is now created and
writen out in once
o Attempts to remove data on remote hosts after the packstach run
CVE-2013-0261
https://bugzilla.redhat.com/show_bug.cgi?id=908101
Change-Id: Ie7105207d3da128d630628c1df037ffafc94beb8
624d49a0e8