Fix: trim whitespace from certain DSN fields (#189)

Trim whitespace from Cloud ID, User and Host field values before
submitting these to the driver
(WS is likely to be inserted if copy&pasting these values.)

Also, rephrase the error message presented to the user in case the Cloud
ID is incorrect.

(cherry picked from commit c4b36bb)

Cherry-pick conflicts:
- driver/connect.c
- dsneditor/EsOdbcDsnEditor/DSNEditorForm.cs
resolved by removing the cloud-id related code from the merge.

Author: bpintea

dsneditor/EsOdbcDsnEditor/DSNEditorForm.cs

@@ -230,9 +230,12 @@ private bool RebuildAndValidateDsn()
 			// Basic Panel
 			Builder["dsn"] = textName.Text;
 			Builder["description"] = textDescription.Text;
-			Builder["uid"] = textUsername.Text;
+			// https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-put-user.html#security-api-put-user-path-params :
+			// "Leading or trailing whitespace is not allowed." -> it is more likely that a user will insert a
+			// (trailing) white space by mistake than intentionally trying to set it.
+			Builder["uid"] = textUsername.Text.Trim();
 			Builder["pwd"] = textPassword.Text;
-			Builder["server"] = textHostname.Text;
+			Builder["server"] = textHostname.Text.Trim();
 			Builder["port"] = numericUpDownPort.Text;
 
 			// Security Panel