out_influxdb: fix timestamp types (#733)
out_influxdb: fix timestamp types (#733)

Timestamps `tm.tv_sec` and `tm.tv_nsec` set in `src/flb_time.c` [here](https://github.com/010akv/fluent-bit/blob/master/src/flb_time.c#L36-L51) will be uint64_t or uint32_t. However, `influxdb_bulk_append_timestamp()` in influxdb plugin assumes uint64_t.  This is not always true. This causes incorrect timestamp values being computed and sent to influxdb.

Adding a global uint64_t constant to fix this issue.

Signed-off-by: Anusha Kasi Vishwanathan <b52970edd8c032fb0e989d51c0189e135afa2108@gmail.com>
nokute78/fluent-bit,fluent/fluent-bit,fluent/fluent-bit,fluent/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,fluent/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,fluent/fluent-bit,fluent/fluent-bit,nokute78/fluent-bit,fluent/fluent-bit,fluent/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,fluent/fluent-bit,fluent/fluent-bit,nokute78/fluent-bit,fluent/fluent-bit,fluent/fluent-bit