Rename natctrl_* iptables rules to tetherctrl_*

Bug: 32163131
Bug: 64995262
Test: bullhead builds and boots
Test: netd_{unit,integration}_test pass
Change-Id: Ifd20920713b2b5b9c22f4c829ef037bbac024505
diff --git a/server/ControllersTest.cpp b/server/ControllersTest.cpp
index 3ca5d81..0c56594 100644
--- a/server/ControllersTest.cpp
+++ b/server/ControllersTest.cpp
@@ -55,12 +55,12 @@
         "-P PREROUTING ACCEPT\n"
         "-A PREROUTING -j bw_raw_PREROUTING\n"
         "-A PREROUTING -j idletimer_raw_PREROUTING\n"
-        "-A PREROUTING -j natctrl_raw_PREROUTING\n"
+        "-A PREROUTING -j tetherctrl_raw_PREROUTING\n"
     );
     std::set<std::string> expectedChains = {
         "bw_raw_PREROUTING",
         "idletimer_raw_PREROUTING",
-        "natctrl_raw_PREROUTING",
+        "tetherctrl_raw_PREROUTING",
     };
     std::set<std::string> actual = findExistingChildChains(V6, "raw", "PREROUTING");
     EXPECT_THAT(expectedChains, ContainerEq(actual));
@@ -88,8 +88,8 @@
                 "-A FORWARD -j fw_FORWARD\n"
                 ":bw_FORWARD -\n"
                 "-A FORWARD -j bw_FORWARD\n"
-                ":natctrl_FORWARD -\n"
-                "-A FORWARD -j natctrl_FORWARD\n"
+                ":tetherctrl_FORWARD -\n"
+                "-A FORWARD -j tetherctrl_FORWARD\n"
                 "COMMIT\n"
         },
         { V4V6, "*raw\n"
@@ -99,15 +99,15 @@
                 "-A PREROUTING -j bw_raw_PREROUTING\n"
                 ":idletimer_raw_PREROUTING -\n"
                 "-A PREROUTING -j idletimer_raw_PREROUTING\n"
-                ":natctrl_raw_PREROUTING -\n"
-                "-A PREROUTING -j natctrl_raw_PREROUTING\n"
+                ":tetherctrl_raw_PREROUTING -\n"
+                "-A PREROUTING -j tetherctrl_raw_PREROUTING\n"
                 "COMMIT\n"
         },
         { V4V6, "*mangle\n"
                 ":FORWARD -\n"
                 "-F FORWARD\n"
-                ":natctrl_mangle_FORWARD -\n"
-                "-A FORWARD -j natctrl_mangle_FORWARD\n"
+                ":tetherctrl_mangle_FORWARD -\n"
+                "-A FORWARD -j tetherctrl_mangle_FORWARD\n"
                 "COMMIT\n"
         },
         { V4V6, "*mangle\n"
@@ -129,8 +129,8 @@
         { V4,   "*nat\n"
                 ":POSTROUTING -\n"
                 "-F POSTROUTING\n"
-                ":natctrl_nat_POSTROUTING -\n"
-                "-A POSTROUTING -j natctrl_nat_POSTROUTING\n"
+                ":tetherctrl_nat_POSTROUTING -\n"
+                "-A POSTROUTING -j tetherctrl_nat_POSTROUTING\n"
                 "COMMIT\n"
         },
         { V4, "*filter\n"