Vault CA requires a unique IntermediatePKIPath for each Datacenter

[GordonMcKinney]

Overview of the Issue

The Consul documentation (here) needs to indicate that the IntermediatePKIPath must be unique per Datacenter.

Reproduction Steps

See issue #6819

Consul info for both Client and Server

Client info

agent:
	check_monitors = 0
	check_ttls = 0
	checks = 3
	services = 2
build:
	prerelease =
	revision = 3cb6eeed
	version = 1.10.2
consul:
	acl = enabled
	known_servers = 3
	server = false
runtime:
	arch = amd64
	cpu_count = 1
	goroutines = 126
	max_procs = 1
	os = linux
	version = go1.16.7
serf_lan:
	coordinate_resets = 0
	encrypted = true
	event_queue = 0
	event_time = 55
	failed = 0
	health_score = 0
	intent_queue = 0
	left = 3
	member_time = 431389
	members = 100
	query_queue = 0
	query_time = 215

Server info

consul info
agent:
	check_monitors = 0
	check_ttls = 0
	checks = 0
	services = 0
build:
	prerelease =
	revision = 3cb6eeed
	version = 1.10.2
consul:
	acl = enabled
	bootstrap = false
	known_datacenters = 3
	leader = false
	leader_addr = 96.103.24.8:8300
	server = true
raft:
	applied_index = 11979292
	commit_index = 11979292
	fsm_pending = 0
	last_contact = 50.292087ms
	last_log_index = 11979292
	last_log_term = 421
	last_snapshot_index = 11974797
	last_snapshot_term = 421
	latest_configuration = [{Suffrage:Voter ID:e883f188-8807-496a-8147-b51d4c0462cb Address:96.103.24.233:8300} {Suffrage:Voter ID:9476a523-5a9c-4af1-8068-1370412e2c11 Address:96.103.24.164:8300} {Suffrage:Voter ID:fb271478-4fbd-4b94-bcec-6dd44ac225d1 Address:96.103.24.8:8300}]
	latest_configuration_index = 0
	num_peers = 2
	protocol_version = 3
	protocol_version_max = 3
	protocol_version_min = 0
	snapshot_version_max = 1
	snapshot_version_min = 0
	state = Follower
	term = 421
runtime:
	arch = amd64
	cpu_count = 2
	goroutines = 2939
	max_procs = 2
	os = linux
	version = go1.16.7
serf_lan:
	coordinate_resets = 0
	encrypted = true
	event_queue = 0
	event_time = 55
	failed = 4
	health_score = 0
	intent_queue = 0
	left = 59
	member_time = 431388
	members = 160
	query_queue = 0
	query_time = 215
serf_wan:
	coordinate_resets = 0
	encrypted = true
	event_queue = 0
	event_time = 1
	failed = 0
	health_score = 0
	intent_queue = 0
	left = 0
	member_time = 483
	members = 9
	query_queue = 0
	query_time = 2

Operating system and Environment details

Amazon Linux 2 AMI

Log Fragments

[GordonMcKinney]

@dnephin Yes, the PR addresses this issue.