webadmin: passing back fingerprint while updating host

While importing the hosts from a gluster cluster,
the hosts are saved along with their sshKeyFingerprint.

While updating the details of the hosts, the sshKeyFingerprint
will be passed back to the backend as it is. If it is not
passed, then backend thinks that the user is trying to update the
sshFingerprint with null and returns an update error to frontend.

Change-Id: I9e73b8bbbf5e7f2281f7a192a0157c2cc395dfc5
Bug-Url: https://bugzilla.redhat.com/888247
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>
webadmin: cleanup volume and brick models

Removed the unnecessary fully qualified class names for
ArrayList.

Change-Id: I909176fa63a6282758304016e53b9f0b6397ed90
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>