If workernode not reply for 300 seconds

A node is unresponsive for cmd = 4, no reconfigure in at least 300 seconds. Setting read-only mode.

if (haltloops == FIVE_MIN_TIMEOUT.tv_sec)

        {

os << "A node is unresponsive for cmd = " << (uint32_t)cmd <<

FIVE_MIN_TIMEOUT is defined with 6 min. (300),
but not configurable.

Under high load with large cluster (5 nodes and more)
reply time can be higher than 6 minutes and FIVE_MIN_TIMEOUT should be configurable
via variable or columnstore.xml entry.