KUDU-1942. Kerberos fails to log in on hostnames with capital letters
KUDU-1942. Kerberos fails to log in on hostnames with capital letters

This ensures that servers canonicalize their FQDNs to lower-case before
generating Kerberos principal names.

With this change I was able to set up a working cluster on my laptop
with a capitalized hostname, where before it would fail as described in
the JIRA.

I also verified that I was able to connect from both C++ and Java
clients.

Change-Id: I5ef65dd827459476a2d225d8e3f7c80ff2fdf627
Reviewed-on: http://gerrit.cloudera.org:8080/7693
Tested-by: Kudu Jenkins
Reviewed-by: Alexey Serbin <864f6b82bd94e8dda64141d4274519ee66e0102e@cloudera.com>
Reviewed-on: http://gerrit.cloudera.org:8080/7893
Reviewed-by: Sailesh Mukil <a0dfbcae8e92bb4f48772d8c6743e175570f6f74@cloudera.com>
Tested-by: Sailesh Mukil <a0dfbcae8e92bb4f48772d8c6743e175570f6f74@cloudera.com>

cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala