Make tag used in IpClientLinkObserver shorter.

So far the log tag used in IpClientLinkObserver is something like
"IpClientLinkObserver/wlan0", the length > 23, just use "IpClient"
instead to make the tag shorter.

Bug: 163492391
Test: m
Change-Id: Ifdb088df393a4a99146a670915f4a8243d63536c
diff --git a/src/android/net/ip/IpClientLinkObserver.java b/src/android/net/ip/IpClientLinkObserver.java
index e73a913..4135f68 100644
--- a/src/android/net/ip/IpClientLinkObserver.java
+++ b/src/android/net/ip/IpClientLinkObserver.java
@@ -178,7 +178,7 @@
         mContext = context;
         mInterfaceName = iface;
         mClatInterfaceName = CLAT_PREFIX + iface;
-        mTag = "IpClientLinkObserver/" + mInterfaceName;
+        mTag = "IpClient/" + mInterfaceName;
         mCallback = callback;
         mLinkProperties = new LinkProperties();
         mLinkProperties.setInterfaceName(mInterfaceName);