[LibOS/test/native] Add manifest template to make exec_fork and script work + fix tcp test

`tcp` test reads tcp.c. This patch adds it to manifest.template to make the test work.

LibOS/shim/test/native/exec_fork.manifest.template

@@ -0,0 +1,24 @@
+loader.preload = file:$(SHIMPATH)
+loader.env.LD_LIBRARY_PATH = /lib
+loader.debug_type = inline
+loader.syscall_symbol = syscalldb
+
+fs.mount.lib.type = chroot
+fs.mount.lib.path = /lib
+fs.mount.lib.uri = file:$(LIBCDIR)
+
+fs.mount.bin.type = chroot
+fs.mount.bin.path = /bin
+fs.mount.bin.uri = file:/bin
+
+sys.brk.size = 32M
+sys.stack.size = 4M
+
+sgx.trusted_files.ld = file:$(LIBCDIR)/ld-linux-x86-64.so.2
+sgx.trusted_files.libc = file:$(LIBCDIR)/libc.so.6
+sgx.trusted_files.libdl = file:$(LIBCDIR)/libdl.so.2
+sgx.trusted_files.libm = file:$(LIBCDIR)/libm.so.6
+sgx.trusted_files.libpthread = file:$(LIBCDIR)/libpthread.so.0
+
+sgx.trusted_files.fork = file:fork
+sgx.trusted_children.fork = file:fork.sig

LibOS/shim/test/native/manifest.template

@@ -27,3 +27,4 @@ sgx.trusted_files.libm = file:$(LIBCDIR)/libm.so.6
 sgx.trusted_files.libpthread = file:$(LIBCDIR)/libpthread.so.0
 
 sgx.trusted_files.unix_pipe = file:unix.c
+sgx.trusted_files.tcp_c = file:tcp.c

LibOS/shim/test/native/script.manifest.template

@@ -0,0 +1,27 @@
+loader.preload = file:$(SHIMPATH)
+loader.env.LD_LIBRARY_PATH = /lib
+loader.debug_type = inline
+loader.syscall_symbol = syscalldb
+
+fs.mount.lib.type = chroot
+fs.mount.lib.path = /lib
+fs.mount.lib.uri = file:$(LIBCDIR)
+
+fs.mount.bin.type = chroot
+fs.mount.bin.path = /bin
+fs.mount.bin.uri = file:/bin
+
+sys.brk.size = 32M
+sys.stack.size = 4M
+
+sgx.trusted_files.ld = file:$(LIBCDIR)/ld-linux-x86-64.so.2
+sgx.trusted_files.libc = file:$(LIBCDIR)/libc.so.6
+sgx.trusted_files.libdl = file:$(LIBCDIR)/libdl.so.2
+sgx.trusted_files.libm = file:$(LIBCDIR)/libm.so.6
+sgx.trusted_files.libpthread = file:$(LIBCDIR)/libpthread.so.0
+
+sgx.trusted_files.script1_sh = file:script1.sh
+sgx.trusted_files.script2_sh = file:script2.sh
+sgx.trusted_files.script3_sh = file:script3.sh
+sgx.trusted_files.helloworld = file:helloworld
+sgx.trusted_children.helloworld = file:helloworld.sig