OCI DMS - Online migration (oracle-livelabs#469)

* Removed one underscore

* Update validate-and-run-terraform.md

fixing one word

* QA completed

* Regular QA fixes

* Update validate-migration.md

Making some steps optional

* Changes on VCN name and added CPAT functionality

* Changes to reflect new functionality and navigation

* Changing the fist capital of an image

* Update introduction.md

* New features implemented and content change required

Registered databases now called Database Connections
GoldenGate Marketplace is replaced by GoldenGate service
ADB is now accessed thru the source base database

* Update manifest.json

updates lab number in manifest

* functionality updated

-Registered databases now is called Database connections
-SSH details are not needed in this lab
-ACL and SSL wallet steps added

* Changes to the terraform labs

Updated functionality and screens in database connections and migrations.

* Minor changes to text and lab duration

* Additional step to test connections

How to test created Database Connections

dms-online/register-and-migrate-terraform/create-registered-databases-terraform.md

@@ -69,6 +69,13 @@ For this task you need the following info from previous steps:
 
   ![Screenshot of  confirm create connection](images/connection-details-cdb.png =50%x*)
 
+7. Press **Test connection** to confirm that your Database Connection details are correct
+
+  ![Screenshot of CDB connection test](images/test-cdb.png =50%x*)
+    - If the test is not successful, correct your connection details and try again.
+
+  ![Screenshot of close connection test](images/close-test.png =50%x*)  
+
 ## Task 2: Create Database Connection for Source PDB
 
 For this task you need the following info from previous steps:
@@ -112,6 +119,13 @@ For this task you need the following info from previous steps:
 
   ![Screenshot of  confirm create connection](images/connection-details-pdb.png =50%x*)
 
+7. Press **Test connection** to confirm that your Database Connection details are correct
+
+  ![Screenshot of PDB connection test](images/test-pdb.png =50%x*)
+    - If the test is not successful, correct your connection details and try again.
+
+  ![Screenshot of close connection test](images/close-test.png =50%x*)  
+
 ## Task 3: Create Database Connection for Target ADB
 
 For this task you need the following info from previous steps:
@@ -149,6 +163,13 @@ For this task you need the following info from previous steps:
 
   Please wait for all Database Connection resources to display as **Active** before proceeding to the next task.
 
+7. Press **Test connection** to confirm that your Database Connection details are correct
+
+  ![Screenshot of CDB connection test](images/test-adb.png =50%x*)
+    - If the test is not successful, correct your connection details and try again.
+
+  ![Screenshot of close connection test](images/close-test.png =50%x*)    
+
 
 ## Task 4: Create Migration
 
@@ -169,7 +190,7 @@ For this task you need the following info from previous steps:
 
   4. Press **Next**
 
-  5. On the page **Select Databases**, fill in the following entries, otherwise leave defaults:
+  5. On the page **Select Databases**, fill in the following entries with the Database Connections created in tasks 1 to 3, otherwise leave defaults:
       - Source Database: **SourcePDB**
       - *Check* Database is pluggable database (PDB)
       - Registered Container Database: **SourceCDB**