CAMEL-7195 Removing default ehcache.xml configuration

camel-cache component will not contain any default Ehcache
configuration, falling back to /ehcache-failsafe.xml.
Merge branch 'CAMEL-7195' of https://github.com/grgrzybek/camel
CAMEL-7195 logging the Ehcache config used
Merge branch 'CAMEL-7195' of https://github.com/grgrzybek/camel