Ensure timeout and disable/enable for connstr test button

[samuelventura]

• Connection Timeout=2; is honored if pointing to a non existing IP with in our network
• Timeouts after 15s if no connection timeout is specified in connstr
• Have not tested cmd.CommandTimeout = 60;
• Critical not to overlap test requests by disabling button untils resolved.

[samuelventura]

• At this moment an invalid or unresponsive fetch path throws an exception
• Need better error handling for REST APIs