Increase the size of REMOTE_MIGRATE_COOKIE_MAX to REMOTE_STRING_MAX
Increase the size of REMOTE_MIGRATE_COOKIE_MAX to REMOTE_STRING_MAX

https://bugzilla.redhat.com/show_bug.cgi?id=1128603

During guest migration, if the domain xml is bigger than 16384 which is
easily possible for a guest with good number of disks, message encode fails
for xdr_remote_domain_migrate_perform3_ret().
So, Increase the COOKIE_MAX to STRING_MAX value.

Signed-off-by: Shivaprasad G Bhat <e3b9a78c646091ad1d0ec2b64f1b4414eea202d9@gmail.com>
(cherry picked from commit eb104e6255c4e69176d3732f6613e18a65c7622e)
Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2