test-gdb: move to pure python calls

run-gdb

@@ -23,8 +23,6 @@ class GdbTestcase:
         '''
         self.prompt = '\(gdb\) '
         self.source_path = source_path
-        self.print_cmd(cmd)
-        cmd = self.strip_newlines(cmd)
         import pexpect
         self.child = pexpect.spawn(
             cmd[0],
@@ -198,10 +196,11 @@ See: https://github.com/cirosantilli/linux-kernel-module-cheat#gdb-builtin-cpu-s
                 cmd.extend(['-ex', 'lx-symbols {}'.format(self.env['kernel_modules_build_subdir']), LF])
         cmd.extend(after)
         if self.env['test']:
+            self.sh.print_cmd(cmd)
             GdbTestcase(
                 self.env['source_path'],
                 test_script_path,
-                cmd,
+                self.sh.strip_newlines(cmd),
                 verbose=self.env['verbose'],
             )
         else: