Monitoring disabled/enabled in all providers

Description:

From high level this release enables the monitoring module to all providers. The monitoring host is disabled by default, but it can be deployed to all cloud provider with the according variables set. (libvirt/google/aws/azure)

Some details:

• fix output.tf - useful for openQA tests (#217 and #220)
• add monitoring for GCP (#219)
• add monitoring for AWS (#203)
• have the choice to disable monitoring on Azure (#182)
• ntpd issue on SLE12+ (#208)
• disable ha_exporter by default (#181)

special thanks to

@juadk, @ldevulder @arbulu89 @ayoub-belarbi @diegoakechi @Simranpal @stefanotorresi si and all others involved with their ideas