Removed Docker production warnings

* Removed warnings.
* Removed inconsistent Community installation sections.
* Fixed all installation page descriptions.
* Removed old .inc files.

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Return devmapper errors with additional text
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
* retry in case of iptables RESOURCE_PROBLEM (exit code 4)
* put --wait parameter at end of iptables rules
Merge branch 'master' of https://github.com/gdm85/docker