micro-osd.sh: set a location for mgr logging
I found this useful when debugging the mock nfs configuration
pool and the nfs mgr module.
@@ -72,6 +72,9 @@ osd objectstore = memstore
osd class load list = *
osd class default list = *
+[mgr.${MGR_NAME}]
+log_file = ${LOG_DIR}/mgr.log
+
[client.rgw.${RGW_ID}]
rgw dns name = ${HOSTNAME}
rgw enable usage log = true
