Netflow v5/v9: Incorrect time calculation for first switched and last switched

[ghost]

In /lib/logstash/codecs/netflow.rb the calculation of absolute timestamps for "first_switched" and "last_switched" is incorrect:

• Milliseconds are subtracted from microseconds without proper conversion
• Syntax error decreasing seconds Solution: Line 139 replace micros = (flowset.unix_nsec / 1000) - (millis % 1000) by micros = (flowset.unix_nsec / 1000) - ((millis % 1000) * 1000) Line 141 replace seconds-- by seconds -= 1 Line 265 replace micros = 1000000 - (millis % 1000) by micros = 1000000 - ((millis % 1000) * 1000)