ACCUMULO-2464 Documentation for how to configure CredentialProviders for sensitive configuration redirection.
Merge branch '1.6.1-SNAPSHOT'

Conflicts:
	docs/src/main/asciidoc/chapters/administration.txt
ACCUMULO-3039 demoted message from WARN to DEBUG
ACCUMULO-3039 demoted message from WARN to DEBUG
Merge branch '1.6.1-SNAPSHOT'