add missing credits to Michael Schenck
added possibility to choose between holding and input registers
renamed Function to ModbusRegisterType
added man page section for ModbusRegisterType
modbus: wrap long lines + indentation/alignment
write_kafka: check for partition availability before selecting one

When a partition is unavailable, sending to it will just lead to a lost
metric. Therefore, after selecting the partition, check if it is
available. If not, select the next one until we tried them all.

A future iteration may use consistent hashing to avoid to double the
work done on a partition when the previous one is unavailable.
Merge pull request #853 from vincentbernat/fix/kafka-unavailable-partitions

write_kafka: check for partition availability before selecting one
Merge https://github.com/collectd/collectd
two infiniband sections in the spec