Move testsupport.h to its own directory

src/common/include.am

@@ -94,7 +94,6 @@ COMMONHEADERS = \
   src/common/procmon.h				\
   src/common/sandbox.h				\
   src/common/storagedir.h			\
-  src/common/testsupport.h			\
   src/common/timers.h				\
   src/common/token_bucket.h			\
   src/common/torlog.h				\

src/include.am

@@ -5,6 +5,7 @@ include src/lib/ctime/include.am
 include src/lib/compress/include.am
 include src/lib/crypt_ops/include.am
 include src/lib/include.libdonna.am
+include src/lib/testsupport/include.am
 include src/lib/tls/include.am
 include src/lib/trace/include.am
 include src/common/include.am

src/lib/testsupport/include.am

+
+noinst_HEADERS += \
+	src/lib/testsupport/testsupport.h