Block SIGPIPE in IptablesRestoreControllerTest.

Otherwise, testRestartOnMalformedCommand fails most of the time
on sailfish.

Test: netd_unit_test no longer crashes
Change-Id: I546950cd3f4cbaed358020f25a27b70702566e54
diff --git a/server/IptablesRestoreControllerTest.cpp b/server/IptablesRestoreControllerTest.cpp
index 96394c1..515dee6 100644
--- a/server/IptablesRestoreControllerTest.cpp
+++ b/server/IptablesRestoreControllerTest.cpp
@@ -45,6 +45,10 @@
   int mIptablesLock = -1;
   std::string mChainName;
 
+  static void SetUpTestCase() {
+      blockSigpipe();
+  }
+
   void SetUp() {
     ASSERT_EQ(0, createTestChain());
   }