Add a new static library for mainline modules

Add a network static library for common utilities. This
library could be used by all mainline modules. Initially
create LinkPropertiesUtils and MacAddressUtils.

Bug: 139268426
Bug: 135998869
Bug: 138306002
Test: build lib pass
      atest NetworkStaticLibTests
Change-Id: I8f79e4f836819ac83007acffb55103e5d69873e0
diff --git a/staticlibs/jarjar-rules-shared.txt b/staticlibs/jarjar-rules-shared.txt
new file mode 100644
index 0000000..4a2b653
--- /dev/null
+++ b/staticlibs/jarjar-rules-shared.txt
@@ -0,0 +1 @@
+rule android.net.util.** com.android.net.module.util.@1