Revision 1910012

Add a configurable retry period for dead servers instead of the currently
hardcoded period of 5 seconds. The default is still 5 seconds.

* include/apr_memcache.h::struct apr_memcache_t:
    Add retry_period to struct.

* memcache/apr_memcache.c::apr_memcache_set_retry_period
    Added setter function for retry_period field

* memcache/apr_memcache.c::apr_memcache_get_retry_period
    Added getter function for retry_period field