adb: change mdns tls service names (RFC 6763).

Even though mdnsresponder seems to allow us to use _adb_secure_connect
and _adb_secure_pairing as service names, these names violate the syntax
outlined in RFC6763, and may not be compatible with other dns-sd
implementations.

Also address some comments from a previous CL.

Bug: 154268895

Test: atest adbd_test
Change-Id: Ia872e976fc4276587b500a827a41d46d9dc755dd
Merged-In: Ia872e976fc4276587b500a827a41d46d9dc755dd
diff --git a/adb/Android.bp b/adb/Android.bp
index 0af82e1..d7477bf 100644
--- a/adb/Android.bp
+++ b/adb/Android.bp
@@ -656,6 +656,7 @@
         "daemon/shell_service_test.cpp",
         "shell_service_protocol.cpp",
         "shell_service_protocol_test.cpp",
+        "mdns_test.cpp",
     ],
 
     shared_libs: [