Allow MINA SSHD to log about host key creation

If there is a problem writing the generated host key to disk, MINA
logs it at level INFO.  We should allow those messages, otherwise
the administrator might not know about a problem.

Bug: GERRIT-210
Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/src/main/java/log4j.properties b/src/main/java/log4j.properties
index 39cee73..27d6547d 100644
--- a/src/main/java/log4j.properties
+++ b/src/main/java/log4j.properties
@@ -22,6 +22,7 @@
 #
 log4j.logger.org.apache.sshd.common=WARN
 log4j.logger.org.apache.sshd.server=WARN
+log4j.logger.org.apache.sshd.common.keyprovider.FileKeyPairProvider=INFO
 
 # Silence non-critical messages from openid4java
 #