update_verifier: correct group in rc file

update_verifier should be in the cache group, not 'class'.

Also use PLOG instead of LOG if care_map.txt cannot be opened.

Bug: 36818743
Test: boot sailfish
Test: fake OTA on sailfish and verify update_verifier reads care_package
Change-Id: I0ec844cac5ef5c63b18ebee90160854fd84ee829
diff --git a/update_verifier/update_verifier.cpp b/update_verifier/update_verifier.cpp
index 59f136c..350020f 100644
--- a/update_verifier/update_verifier.cpp
+++ b/update_verifier/update_verifier.cpp
@@ -167,7 +167,7 @@
     // in /data/ota_package. To allow the device to continue booting in this situation,
     // we should print a warning and skip the block verification.
     if (care_map_fd.get() == -1) {
-        LOG(WARNING) << "Warning: care map " << care_map_name << " not found.";
+        PLOG(WARNING) << "Failed to open " << care_map_name;
         return true;
     }
     // Care map file has four lines (two lines if vendor partition is not present):
diff --git a/update_verifier/update_verifier.rc b/update_verifier/update_verifier.rc
index fc8a64d..75cfeb2 100644
--- a/update_verifier/update_verifier.rc
+++ b/update_verifier/update_verifier.rc
@@ -1,11 +1,11 @@
 service update_verifier_nonencrypted /system/bin/update_verifier nonencrypted
     user root
-    class cache
+    group cache
     priority -20
     ioprio rt 1
 
 service update_verifier /system/bin/update_verifier ${vold.decrypt}
     user root
-    class cache
+    group cache
     priority -20
     ioprio rt 1
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