findbugs: ignore: Redundant null check from getConfigValue

findbugs complains that we are checking ldapPort for null when its not
suppose to be null.
in this case we are checking for the return value from getConfigValue()
and we may have a null value from the Database

findbugs reason:
RCN: Redundant nullcheck of value known to be non-null

Change-Id: If712c28362bae2cfa756c14d8cadf1e96fc3e187
Signed-off-by: Shahar Havivi <shavivi@redhat.com>