Upgrade Docker provider

• Upgrade Docker provider

Vault v1.6.1

• Vault version 1.6.1

Vault and Consul upgrades

• Vault v1.6.0
• Consul v1.9.0
• Switch to kreuzwerker/docker
• Update documentation

Vault 1.5.3 and more

• Vault 1.5.3
• Fix form script
• Remove deprecated use_vault_oss configuration
• Update documentation

Upgrade for Terraform 0.13 and more

• Upgrade for Terraform 0.13 compatibility
• Simplified required environment variable configuration for flavors & counts
• Add vault_disable_mlock configuration
  • Default is true for integrated storage (raft flavor)
  • Default is false for Consul storage (consul flavor)
• Update documentation

Vault 1.5.2, Consul 1.8.3 and more

• Vault v1.5.2
• Consul v1.8.3
• Update scripts
• Update documentation

Vault v1.5.0, Consul v1.8.1, and more

• Vault v1.5.0
• Consul v1.8.1
• Update scripts
• Update documentation

Vault v1.4.3

• Vault v1.4.3
• Katacoda awareness circuit

Consul v1.8.0 and more

• Consul v1.8.0
• Configurable DOCKER_HOST TF variable
• Updates scripts
• Update documentation

Consul v1.7.4

• Consul 1.7.4
• Update documentation