mgmt: rename 'datas' to 'data' in FaceStatus and ForwarderStatus

Plural form of 'data' is 'data'.

refs #3955

Change-Id: I225a384c9a9ecf784f8cd55df19d391931619984
diff --git a/tests/unit-tests/mgmt/nfd/face-status.t.cpp b/tests/unit-tests/mgmt/nfd/face-status.t.cpp
index d2342f2..16fe108 100644
--- a/tests/unit-tests/mgmt/nfd/face-status.t.cpp
+++ b/tests/unit-tests/mgmt/nfd/face-status.t.cpp
@@ -44,10 +44,10 @@
       .setLinkType(LINK_TYPE_MULTI_ACCESS)
       .setExpirationPeriod(time::seconds(10))
       .setNInInterests(10)
-      .setNInDatas(200)
+      .setNInData(200)
       .setNInNacks(1)
       .setNOutInterests(3000)
-      .setNOutDatas(4)
+      .setNOutData(4)
       .setNOutNacks(2)
       .setNInBytes(1329719163)
       .setNOutBytes(999110448)