MXS-1587 Rename mysqlmon to mariadbmon

'mysqlmon' is still accepted but 'mariadbmon' is loaded instead.
This is done at runtime instead of e.g. by using a symbolic link,
so that a warning can be logged.

The warning is logged and the translation of the module name is
made by the code that loads the modules so that it's easy to do
the same thing for other modules as well.

In a subsequent commit the documentation is updated.

server/modules/monitor/CMakeLists.txt

@@ -1,6 +1,6 @@
 add_subdirectory(galeramon)
 add_subdirectory(mmmon)
-add_subdirectory(mysqlmon)
+add_subdirectory(mariadbmon)
 add_subdirectory(ndbclustermon)
 add_subdirectory(auroramon)
 add_subdirectory(grmon)

server/modules/monitor/mariadbmon/CMakeLists.txt

@@ -0,0 +1,5 @@
+add_library(mariadbmon SHARED mysql_mon.cc)
+target_link_libraries(mariadbmon maxscale-common)
+add_dependencies(mariadbmon pcre2)
+set_target_properties(mariadbmon PROPERTIES VERSION "1.4.0")
+install_module(mariadbmon core)

server/modules/monitor/mysqlmon/CMakeLists.txt

@@ -1,5 +0,0 @@
-add_library(mysqlmon SHARED mysql_mon.cc)
-target_link_libraries(mysqlmon maxscale-common)
-add_dependencies(mysqlmon pcre2)
-set_target_properties(mysqlmon PROPERTIES VERSION "1.4.0")
-install_module(mysqlmon core)