The server information in galeramon is gathered every monitoring
interval. To prevent stale information from being used, the server
information needs to be cleared at the start of each monitoring interval.
Replaced the HASHTABLE in galeramon with an std::unordered_map. This
simplifies the code by a great amount and makes it more readable. Removed
the extraneous functions that mostly logged debug information and
simplified the logic by removing redundant checks.
MonitorInstanceSimple is intended for simple monitors that
probe servers in a straightforward fashion. More complex monitors
can be derived directly from MonitorInstance.
The configuring of the monitor instance is now performed in a
separate function. That is in preparation for the moving of the
start function to maxscale::MonitorInstance.
- All monitors (but MariaDBMon for the time being) inherit
from that.
- All common member variables moved to that class. Still
manipulated in derived classes.
In subsequent commits common functionality will be moved to
that class.
