Support consul enterprise namespaces in consul catalog provider

Co-authored-by: Romain <rtribotte@users.noreply.github.com>

docs/content/reference/static-configuration/cli-ref.md

@@ -432,6 +432,9 @@ Token is used to provide a per-request ACL token which overrides the agent's def
 `--providers.consulcatalog.exposedbydefault`:  
 Expose containers by default. (Default: ```true```)
 
+`--providers.consulcatalog.namespace`:  
+Sets the namespace used to discover services (Consul Enterprise only).
+
 `--providers.consulcatalog.prefix`:  
 Prefix for consul service tags. Default 'traefik' (Default: ```traefik```)
 

docs/content/reference/static-configuration/env-ref.md

@@ -405,6 +405,9 @@ Token is used to provide a per-request ACL token which overrides the agent's def
 `TRAEFIK_PROVIDERS_CONSULCATALOG_EXPOSEDBYDEFAULT`:  
 Expose containers by default. (Default: ```true```)
 
+`TRAEFIK_PROVIDERS_CONSULCATALOG_NAMESPACE`:  
+Sets the namespace used to discover services (Consul Enterprise only).
+
 `TRAEFIK_PROVIDERS_CONSULCATALOG_PREFIX`:  
 Prefix for consul service tags. Default 'traefik' (Default: ```traefik```)
 

docs/content/reference/static-configuration/file.toml

@@ -148,6 +148,7 @@
     cache = true
     exposedByDefault = true
     defaultRule = "foobar"
+    namespace = "foobar"
     [providers.consulCatalog.endpoint]
       address = "foobar"
       scheme = "foobar"

docs/content/reference/static-configuration/file.yaml

@@ -160,6 +160,7 @@ providers:
     cache: true
     exposedByDefault: true
     defaultRule: foobar
+    namespace: foobar
     endpoint:
       address: foobar
       scheme: foobar