Bug fix while working on running standalone VC without experiment ID explicitly passing in client server scenario

Author: nmalkapuram

src/VirtualClient/VirtualClient.Actions/HammerDB/HammerDBExecutor.cs

@@ -84,7 +84,7 @@ public string SuperUserPassword
         {
             get
             {
-                byte[] hashBytes = SHA256.HashData(Encoding.UTF8.GetBytes(this.ExperimentId));
+                byte[] hashBytes = SHA256.HashData(Encoding.UTF8.GetBytes("postgres"));
                 return Convert.ToBase64String(hashBytes);
             }
         }

src/VirtualClient/VirtualClient.Actions/Sysbench/SysbenchExecutor.cs

@@ -152,7 +152,7 @@ public string SuperUserPassword
         {
             get
             {
-                byte[] hashBytes = SHA256.HashData(Encoding.UTF8.GetBytes(this.ExperimentId));
+                byte[] hashBytes = SHA256.HashData(Encoding.UTF8.GetBytes("postgres"));
                 return Convert.ToBase64String(hashBytes);
             }
         }

src/VirtualClient/VirtualClient.Dependencies/PostgreSQLServer/PostgreSQLServerConfiguration.cs

@@ -108,7 +108,7 @@ public string SuperUserPassword
         {
             get
             {
-                byte[] hashBytes = SHA256.HashData(Encoding.UTF8.GetBytes(this.ExperimentId));
+                byte[] hashBytes = SHA256.HashData(Encoding.UTF8.GetBytes("postgres"));
                 return Convert.ToBase64String(hashBytes);
             }
         }