Test for GDB server in ukvm

gdb-test.sh

./tests/test_hello/ukvm-bin --gdb ./tests/test_hello/test_hello.ukvm &
gdb \
	--eval-command="set confirm off" \
	--eval-command="shell sleep 1" \
	--eval-command="target remote localhost:1234"  \
	--eval-command="set {int} 0x00040000 = 12345" \
	--eval-command="p {int} 0x00040000" \
	--eval-command="b solo5_console_write" \
	--eval-command="c" \
	--eval-command="c" \
	--eval-command="d 1" \
	--eval-command="hb solo5_console_write" \
	--eval-command="c" \
	--eval-command="c" \
	--eval-command="bt" \
	--eval-command="l" \
	--eval-command="d 2" \
	--eval-command="set \$gs=0x1234" \
	--eval-command="info registers" \
	--eval-command="c" \
	--eval-command="quit" \
	tests/test_hello/test_hello.ukvm