Fix node namespace.
Remove format specifiers with no options.
Fix iptables for old systems

The iptables args list needs to include all fields as they are eventually spit
out by iptables-save.  This is because some systems do not support the
'iptables -C' arg, and so fall back on parsing iptables-save output.  If this
does not match, it will not pass the check.  For example: adding the /32 on
the destination IP arg is not strictly required, but causes this list to not
match the final iptables-save output.  This is fragile and I hope one day we
can stop supporting such old iptables versions.
Merge pull request #2610 from ddysher/node-namespace

Fix node namespace.
Merge pull request #2638 from thockin/iptables

Fix iptables for old systems
Revert "Fix link to authentication document"
Merge pull request #2640 from GoogleCloudPlatform/revert-2629-fix_auth_link

Revert "Fix link to authentication document"
Fix head
Merge pull request #2641 from thockin/fix-head

Fix head
Merge pull request #2636 from erictune/service_env_var

	Remove format specifiers with no options.