Update to version 1.2.11

• Repeated warnings due to 'Recache Event Detected for Device'
• No error is recorded to log file when database is incorrect
• MySQL retry logic is not working as expected
• When using IPv6 address, segmentation fault can occur due to incorrectly using IPv4 ping
• When polling results are null, segmentation errors may occur
• When collecting data, spine should be stripping alpha characters from output