added config options sleep_delay and sleep_monitor

sleep_monitor replaces the old SLEEP_MONITOR define and makes it
configurable; this is the interval in which we monitor

sleep_delay replaces the old sleep(300) when waiting for the master to
recover.

repmgr.h

@@ -71,6 +71,4 @@ typedef struct
 
 #define T_RUNTIME_OPTIONS_INITIALIZER { "", "", "", "", "", "", DEFAULT_WAL_KEEP_SEGMENTS, false, false, false, false, "", "", 0 }
 
-#define SLEEP_MONITOR		2
-
 #endif