Fix MultinetworkApiTest for instant mode

add AppModeFull@ to MultinetworkApiTest since CHANGE_NETWORK_STATE
could not be granted in instant mode.

CHANGE_NETWORK_STATE is required to select networks that are up but
not in the foreground, for example, the mobile network after the linger
timer has expired.

Bug: 168809106
Bug: 171233760
Test: atest MultinetworkApiTest
      atest MultinetworkApiTest --instant

Signed-off-by: Weilun Du <wdu@google.com>
Change-Id: I37ca1a0f58d1c2ab57f8cd4489c2cfb13b0f2d39
(cherry picked from commit efe2048c48a2a9ac0812f209c87318cd68191c37)
diff --git a/tests/tests/net/src/android/net/cts/MultinetworkApiTest.java b/tests/tests/net/src/android/net/cts/MultinetworkApiTest.java
index 6d3db89..691ab99 100644
--- a/tests/tests/net/src/android/net/cts/MultinetworkApiTest.java
+++ b/tests/tests/net/src/android/net/cts/MultinetworkApiTest.java
@@ -103,6 +103,7 @@
         }
     }
 
+    @AppModeFull(reason = "CHANGE_NETWORK_STATE permission can't be granted to instant apps")
     public void testSetprocnetwork() throws ErrnoException {
         // Hopefully no prior test in this process space has set a default network.
         assertNull(mCM.getProcessDefaultNetwork());
@@ -145,6 +146,7 @@
         }
     }
 
+    @AppModeFull(reason = "CHANGE_NETWORK_STATE permission can't be granted to instant apps")
     public void testSetsocknetwork() throws ErrnoException {
         for (Network network : getTestableNetworks()) {
             int errno = runSetsocknetwork(network.getNetworkHandle());