Introduce Timestamps Option via mgmt.sock (Azure#4988)

Cherry-pick: Azure@37c661b

- Allow Management socket to accept `timestamps` option to be pass through docker socket API.
- Update the documents for the latest API version
- The latest API is being manually added since there is a gigantic out-of-sync between the template interface `managementVersion_2020_07_07.yaml` and `/edgelet/management` generated code.

edgelet/api/README.md

@@ -0,0 +1,52 @@
+# How to build Management API using Swagger-Codegen
+1. Install Java & Maven 
+```sh
+   sudo apt-get install openjdk-8-jdk
+   ## It only works on JAVA8 see https://computingforgeeks.com/how-to-set-default-java-version-on-ubuntu-debian/ how to switch between Java versions
+   sudo apt install maven
+```
+2. Clone swagger codegen repo:
+```sh
+   cd ~
+   git clone https://github.com/swagger-api/swagger-codegen.git
+```
+3. Test build if installation was done correctly ( https://github.com/swagger-api/swagger-codegen#building ) 
+```sh
+   cd swagger-codegen
+   mvn clean install -N
+   mvn clean package
+```
+4. Build swagger-codegen
+```sh
+   cd modules/swagger-codegen
+   mvn clean package
+
+   ## Make sure /target/*.jar is created
+   ls
+```
+5. Build swagger-codegen-cli
+```sh
+   cd ~/swagger-codegen/modules/swagger-codegen-cli
+   mvn clean package
+
+   ## Make sure /target/*.jar is created
+   ls 
+```
+6. Put it all together and build API
+    - Run the following command 
+```sh
+		 java -cp <abs/path/to/jar/step4>:<abs/path/to/jar/step5> \
+		 io.swagger.codegen.SwaggerCodegen generate \
+		 -l rust \
+		 -i <abs/path/to/iotedge/mgmt/yaml> \
+		 -o <abs/path/to/output/folder>
+
+        ## Example Command
+		 java -cp /home/iotedgeuser/swagger-codegen/modules/swagger-codegen/target/swagger-codegen-2.4.20-SNAPSHOT.jar:/home/iotedgeuser/swagger-codegen/modules/swagger-codegen-cli/target/swagger-codegen-cli.jar \
+		 io.swagger.codegen.SwaggerCodegen generate \
+		 -l rust \
+		 -i /home/iotedgeuser/iotedge/edgelet/api/managementVersion_2020_07_07.yaml \
+		 -o /home/iotedgeuser/management
+```
+# Note #
+We've manually fixed up the generated code so that it satisfies rustfmt and clippy. As such, if you ever need to run `swagger-codegen-cli` against new definitions, or need to regenerate existing ones, you will want to perform the same fixups manually. Make sure to run clippy and rustfmt against the new code yourself, and inspect the diffs of modified files before checking in.