Add support for console on tty1

When running moby under other hypervisors, requiring troubleshooting on
the serial port can be painful.  This change enables console support on
tty1 similar to the way prior boot2docker images worked.

alpine/etc/securetty

@@ -1,3 +1,4 @@
 console
 ttyS0
 ttyAMA0
+tty1

alpine/inittab.x86_64

@@ -7,6 +7,9 @@
 # Put a getty on the serial port
 ttyS0::respawn:/sbin/getty -L ttyS0 115200 vt100
 
+# Put a getty on the console
+tty1::respawn:/sbin/getty 115200 tty1 linux
+
 # Stuff to do for the 3-finger salute
 ::ctrlaltdel:/sbin/reboot
 

alpine/isolinux.cfg

@@ -2,4 +2,4 @@ DEFAULT linux
 LABEL linux
     KERNEL /vmlinuz64
     INITRD /initrd.img
-    APPEND earlyprintk=serial console=ttyS0
+    APPEND earlyprintk=serial console=ttyS0 console=tty0

alpine/kernel/kernel_config

@@ -1753,7 +1753,8 @@ CONFIG_INPUT_EVDEV=y
 #
 # Input Device Drivers
 #
-# CONFIG_INPUT_KEYBOARD is not set
+CONFIG_INPUT_KEYBOARD=y
+CONFIG_KEYBOARD_ATKBD=y
 # CONFIG_INPUT_MOUSE is not set
 # CONFIG_INPUT_JOYSTICK is not set
 # CONFIG_INPUT_TABLET is not set
@@ -1780,7 +1781,7 @@ CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y
 #
 CONFIG_SERIO=y
 CONFIG_ARCH_MIGHT_HAVE_PC_SERIO=y
-# CONFIG_SERIO_I8042 is not set
+CONFIG_SERIO_I8042=y
 CONFIG_SERIO_SERPORT=y
 # CONFIG_SERIO_CT82C710 is not set
 CONFIG_SERIO_PCIPS2=y
@@ -2367,7 +2368,7 @@ CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y
 #
 # HID support
 #
-# CONFIG_HID is not set
+CONFIG_HID=y
 
 #
 # I2C HID support