[fix] Remove logging for run_target format.

Bug: 152256593
Test: manually
Change-Id: I46a370521b255f5e4060754f08b42494d34ce2c6
diff --git a/src/com/android/tradefed/cluster/ClusterHostUtil.java b/src/com/android/tradefed/cluster/ClusterHostUtil.java
index 1755c44..b68c9c1 100644
--- a/src/com/android/tradefed/cluster/ClusterHostUtil.java
+++ b/src/com/android/tradefed/cluster/ClusterHostUtil.java
@@ -149,9 +149,6 @@
                                         pattern, runTargetFormat));
                 }
                 if (txt == null || DeviceManager.UNKNOWN_DISPLAY_STRING.equals(txt)) {
-                    CLog.i(
-                            "No value found for pattern %s while formatting run target %s.",
-                            pattern, runTargetFormat);
                     return DeviceManager.UNKNOWN_DISPLAY_STRING;
                 }
                 m.appendReplacement(sb, Matcher.quoteReplacement(txt));