Change Tethering package name

".apex" is easy to confuse.
Rename as below:
apex: com.android.tethering.apex -> com.android.tethering
apk: com.android.tethering -> com.android.networkstack.tethering

Bug: 146471733
Test: build

Change-Id: I2c7647abb996539a3af6cfe0e0214a5e8927c0d6
diff --git a/Tethering/apex/com.android.tethering.x509.pem b/Tethering/apex/com.android.tethering.x509.pem
new file mode 100644
index 0000000..a1786e3
--- /dev/null
+++ b/Tethering/apex/com.android.tethering.x509.pem
@@ -0,0 +1,35 @@
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