Health and heartbeat checks/lbmethod for RevProxy

Basics:
- (0_)watchdog.load

Health:
- proxy_hcheck.load

Heartbeat:
- heartbeat.load
- heartmonitor.load
- lbmethod_heartbeat.load

mods-available/0_watchdog.load

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+# mod_watchdog must be loaded BEFORE other modules using it!
+LoadModule watchdog_module modules/mod_watchdog.so

mods-available/heartbeat.load

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+# Depends: 0_watchdog status
+LoadModule heartbeat_module modules/mod_heartbeat.so

mods-available/heartmonitor.load

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+# Depends: 0_watchdog status
+LoadModule heartmonitor_module modules/mod_heartmonitor.so

mods-available/lbmethod_heartbeat.load

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+# Depends: proxy_balancer heartmonitor
+LoadModule lbmethod_heartbeat_module modules/mod_lbmethod_heartbeat.so

mods-available/proxy_hcheck.load

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+# Depends: 0_watchdog proxy
+LoadModule proxy_hcheck_module modules/mod_proxy_hcheck.so