Double to single quotes.
Make `salt.payload.SREQ` IPv6 aware.

Since `salt.payload.SREQ` also checks for the `IPV4ONLY` attribute, which was added because of the IPv6 support, and that has proven problematic in some networks, we only set `IPV4ONLY` if IPv6 support is enabled.
Merge branch 'hotfix/sreq-ipv6-support' of git://github.com/s0undt3ch/salt into s0undt3ch-hotfix/sreq-ipv6-support

Conflicts:
	salt/utils/__init__.py