Update image version tags in Dockerfile comments (#4631)

* Fix typos on Docker image versions that we are currently running
   as part of CI

 * Add version comment in the same pattern for ci_lint image

docker/Dockerfile.ci_cpu

@@ -16,7 +16,7 @@
 # under the License.
 
 # CI docker CPU env
-# tag: v0.41
+# tag: v0.54
 FROM ubuntu:16.04
 
 RUN apt-get update --fix-missing

docker/Dockerfile.ci_gpu

@@ -16,7 +16,7 @@
 # under the License.
 
 # CI docker GPU env
-# tag: v0.54
+# tag: v0.56
 FROM nvidia/cuda:10.0-cudnn7-devel-ubuntu16.04
 
 # Base scripts

docker/Dockerfile.ci_i386

@@ -16,7 +16,7 @@
 # under the License.
 
 # CI docker i386 env
-# tag: v0.50
+# tag: v0.53
 
 FROM ioft/i386-ubuntu:16.04
 

docker/Dockerfile.ci_lint

@@ -17,6 +17,7 @@
 
 # For lint test
 # CI docker lint env
+# tag: v0.51
 FROM ubuntu:16.04
 
 RUN apt-get update && apt-get install -y sudo wget