Changes to configuring otel from env only

These are standard environment variables described by the otel spec in
https://opentelemetry.io/docs/specs/otel/configuration/sdk-environment-variables/.

The old config options are removed

Also since otel will by default try to connect to https://localhost:4318
if no endpoint is set, this will also just disable the otlp plugin when
there is no endpoint so we don't have otel continuously trying to
connect to the default endpoint, littering the logs with connection
failure messages and collecting traces that won't go anywhere.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

integration/client/testdata/default-1.6.toml

@@ -168,9 +168,10 @@ version = 2
   [plugins."io.containerd.internal.v1.restart"]
     interval = "10s"
 
-  [plugins."io.containerd.internal.v1.tracing"]
-    sampling_ratio = 1.0
-    service_name = "containerd"
+  # Removed in latest
+  #[plugins."io.containerd.internal.v1.tracing"]
+  #  sampling_ratio = 1.0
+  #  service_name = "containerd"
 
   [plugins."io.containerd.metadata.v1.bolt"]
     content_sharing_policy = "shared"
@@ -225,10 +226,11 @@ version = 2
   #[plugins."io.containerd.snapshotter.v1.zfs"]
   #  root_path = ""
 
-  [plugins."io.containerd.tracing.processor.v1.otlp"]
-    endpoint = ""
-    insecure = false
-    protocol = ""
+  # Removed in latest
+  #[plugins."io.containerd.tracing.processor.v1.otlp"]
+  #  endpoint = ""
+  #  insecure = false
+  #  protocol = ""
 
 [proxy_plugins]
 

integration/client/testdata/default-1.7.toml

@@ -185,9 +185,10 @@ version = 2
   [plugins."io.containerd.internal.v1.restart"]
     interval = "10s"
 
-  [plugins."io.containerd.internal.v1.tracing"]
-    sampling_ratio = 1.0
-    service_name = "containerd"
+  # Removed in latest
+  #[plugins."io.containerd.internal.v1.tracing"]
+  #  sampling_ratio = 1.0
+  #  service_name = "containerd"
 
   [plugins."io.containerd.metadata.v1.bolt"]
     content_sharing_policy = "shared"
@@ -258,10 +259,11 @@ version = 2
   #[plugins."io.containerd.snapshotter.v1.zfs"]
   #  root_path = ""
 
-  [plugins."io.containerd.tracing.processor.v1.otlp"]
-    endpoint = ""
-    insecure = false
-    protocol = ""
+  # Removed in latest
+  #[plugins."io.containerd.tracing.processor.v1.otlp"]
+  #  endpoint = ""
+  #  insecure = false
+  #  protocol = ""
 
   [plugins."io.containerd.transfer.v1.local"]
     config_path = ""