Hide IpSecManager, IpSecTransform, and IpSecAlgorithm

These classes, originally planned to be part of the
public API, are not ready for public consumption.
They are planned to be un-hidden in a future release.

Bug: 37681043
Test: make update-api and make
Change-Id: I8caccd3f8455341cb56a2256354eacbadedff047

core/java/android/net/IpSecAlgorithm.java

@@ -24,6 +24,8 @@ import java.lang.annotation.RetentionPolicy;
 /**
  * IpSecAlgorithm specifies a single algorithm that can be applied to an IpSec Transform. Refer to
  * RFC 4301.
+ *
+ * @hide
  */
 public final class IpSecAlgorithm implements Parcelable {
 

core/java/android/net/IpSecManager.java

@@ -37,6 +37,8 @@ import java.net.Socket;
  * <p>An IpSecManager may be obtained by calling {@link
  * android.content.Context#getSystemService(String) Context#getSystemService(String)} with {@link
  * android.content.Context#IPSEC_SERVICE Context#IPSEC_SERVICE}
+ *
+ * @hide
  */
 public final class IpSecManager {
     private static final String TAG = "IpSecManager";

core/java/android/net/IpSecTransform.java

@@ -45,6 +45,8 @@ import java.net.InetAddress;
  *
  * <p>An IpSecTransform may either represent a tunnel mode transform that operates on a wide array
  * of traffic or may represent a transport mode transform operating on a Socket or Sockets.
+ *
+ * @hide
  */
 public final class IpSecTransform implements AutoCloseable {
     private static final String TAG = "IpSecTransform";