Update EC2 instance type volumes specification for m2.xlarge

[cwhelan]

The definition for m2.xlarge in org.jclouds.ec2.compute.domain.EC2HardwareBuilder has a single 420GB Volume that is also the boot drive.

    /**
      * @see InstanceType#M2_XLARGE
      */
      public static EC2HardwareBuilder m2_xlarge() {
      return new EC2HardwareBuilder(InstanceType.M2_XLARGE).ram(17510)
            .processors(ImmutableList.of(new Processor(2.0, 3.25)))
            .volumes(ImmutableList.<Volume> of(new VolumeImpl(420.0f, "/dev/sda1", true, false))).is64Bit(true);
      }

However, when I create an instance using Ubuntu 10.04 AMI ami-bffa6fd6, what you actually get looks like it has a 10GB boot volume on /dev/sda1

$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1             10403128   1156388   8827312  12% /
devtmpfs               8685400       108   8685292   1% /dev
none                   8960512         0   8960512   0% /dev/shm
none                   8960512        56   8960456   1% /var/run
none                   8960512         0   8960512   0% /var/lock
none                   8960512         0   8960512   0% /lib/init/rw

And then a 420GB volume unmounted on /dev/sdb:

$ cat /etc/fstab 
# /etc/fstab: static file system information.
# <file system>                                 <mount point>   <type>  <options>       <dump>  <pass>
proc                                            /proc           proc    defaults        0       0
/dev/sda1                                       /               ext3    defaults        0       0
# cloud-config mounts
/dev/sdb    /mnt    auto    defaults    0   0

After mounting /dev/sdb on /data1:

$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1             10403128   1156392   8827308  12% /
devtmpfs               8685400       108   8685292   1% /dev
none                   8960512         0   8960512   0% /dev/shm
none                   8960512        56   8960456   1% /var/run
none                   8960512         0   8960512   0% /var/lock
none                   8960512         0   8960512   0% /lib/init/rw
/dev/sdb             423135208    203084 401438084   1% /data1

The definition should be updated to reflect the current volumes.

I'm not sure about other instance types, it might be worth checking them too.