Add conditions to AWSMachine

[gab-satchi]

Describe the solution you'd like As a developer, I would like to see Conditions on an AWSMachine expressing the current state so that I could use that info for higher level objects (AWSCluster).

Anything else you would like to add: AWSMachine controller does the following at the infrastructure level:

• Create EC2 instance (with encrypted user data)
• Attach (control plane) instance to ELB
• Ensure security groups are up-to-date
• Delete encrypted user data once it's no longer needed

Proposing to create the following conditions on the AWSMachine object

// InstanceReady reports on current status of the EC2 instance. Ready indicates the instance is in a Running state. 
// When set to false, severity can be a Warning if the instance state is pending, stopping, stopped
// When set to false, severity can be an Error if the instance state is shutting down, terminated or unknown. 
InstanceReady ConditionType = "InstanceReady"

// SecurityGroupsReady indicates the security groups are up to date on the AWSMachine. 
SecurityGroupsReady ConditionType = "SecurityGroupsReady"

// Only applicable to control plane machines. ELBAttached will report true when a control plane is successfully registered with an ELB
// When set to false, severity can be an Error if the subnet is not found or unavailable in the instance's AZ
ELBAttached ConditionType = "ELBAttached"

An aggregate Ready condition is also required to report the overall status of the AWSMachine.

Original Conditions CAEP

/kind feature

[detiber]

/priority important-soon /milestone v0.5.x

[gab-satchi]

/assign

[gab-satchi]

The PR for this is ready, just waiting for CAPI release. Can this fit into v0.5.5 release? @detiber