providers/aws: pass pointers directly to d.Set in RDS

block device support for launch configurations

 - mimics block device support from AWS instance
 - splits the acceptance tests out so they all pass, handling a FIXME
   from #1079

RFC for making launch configuration names computed.

provider/openstack: documentation updates

providers/digitalocean: fix ssh key test

Fix(docs) Correct spelling error in Docker documentation

there's now validation on the public key field

provider/openstack Compute Network Refactor

Add support for SSH Agent

Feature: Remote Modules

A change was made to account for clouds with multiple networks.

Granular exit code during terraform plan

Changes the test to require a network UUID rather than a name.

This commit resolves an issue where the tenant-network api extension
does not exist. The caveat is that the user must either specify no
networks (single network environment) or can only specify UUIDs for
network configurations.

provider/aws: Add non-destructive updates to AWS RDS

* master: (167 commits)
  return error if failed to set tags on Route 53 zone
  core: [tests] fix order dependent test
  Fix hashcode for ASG test
  provider/aws: Fix issue with tainted ASG groups failing to re-create
  Don't error when reading s3 bucket with no tags
  Avoid panics when DBName is not set
  Add floating IP association in aceptance tests
  Use env var OS_POOL_NAME as default for pool attribute
  providers/heroku: Add heroku-postgres to example
  docs: resource addressing
  providers/heroku: Document environment variables
  providers/heroku: Add region to example
  Bugfix on floating IP assignment
  Update CHANGELOG.md
  update CHANGELOG
  website: note on docker
  core: formalize resource addressing
  core: fill out context tests for targeted ops
  core: docs for targeted operations
  core: targeted operations
  ...

Add Tags to AWS RDS

* upstream/master:
  return error if failed to set tags on Route 53 zone
  cleanups
  provider/aws: Finish Tag support for Route 53 zone
  provider/aws: Add tags to Route53 hosted zones

provider/aws: Add tags to Route53 hosted zones

* master: (172 commits)
  core: [tests] fix order dependent test
  Fix hashcode for ASG test
  provider/aws: Fix issue with tainted ASG groups failing to re-create
  Don't error when reading s3 bucket with no tags
  Avoid panics when DBName is not set
  Add floating IP association in aceptance tests
  Use env var OS_POOL_NAME as default for pool attribute
  providers/heroku: Add heroku-postgres to example
  docs: resource addressing
  providers/heroku: Document environment variables
  providers/heroku: Add region to example
  Bugfix on floating IP assignment
  Update CHANGELOG.md
  update CHANGELOG
  website: note on docker
  core: formalize resource addressing
  core: fill out context tests for targeted ops
  core: docs for targeted operations
  core: targeted operations
  user_data support
  ...

* master: (172 commits)
  core: [tests] fix order dependent test
  Fix hashcode for ASG test
  provider/aws: Fix issue with tainted ASG groups failing to re-create
  Don't error when reading s3 bucket with no tags
  Avoid panics when DBName is not set
  Add floating IP association in aceptance tests
  Use env var OS_POOL_NAME as default for pool attribute
  providers/heroku: Add heroku-postgres to example
  docs: resource addressing
  providers/heroku: Document environment variables
  providers/heroku: Add region to example
  Bugfix on floating IP assignment
  Update CHANGELOG.md
  update CHANGELOG
  website: note on docker
  core: formalize resource addressing
  core: fill out context tests for targeted ops
  core: docs for targeted operations
  core: targeted operations
  user_data support
  ...

* d.Set has a pointer nil check we can lean on
* need to be a bit more conservative about nil checks on nested structs;
  (this fixes the RDS acceptance tests)

/cc @fanhaf

This allows the obtained network information to be successfully stored
for environments that do not require a network resource to be specified.

* f-aws-asg-fix-drain-delete:
  Fix hashcode for ASG test