* doc/am-utils.texi, scripts/{amd.conf.5,amd.conf-sample}:

* doc/am-utils.texi, scripts/{amd.conf.5,amd.conf-sample}:
document new nfs_retransmit_counter_toplvl and
nfs_retry_interval_toplvl global amd.conf parameters.

* amd/conf.c (gopt_nfs_retransmit_counter_toplvl,
(gopt_nfs_retry_interval_toplvl): parse amd.conf
nfs_retransmit_counter_toplvl and nfs_retry_interval_toplvl global
parameters.

* amd/amfs_toplvl.c (amfs_toplvl_mount): support setting toplvl
timeo/retrans parameters for Amd's toplvl mounts, separately from
all other UDP or NFS mounts.

* amd/amd.h: define a new timeo/retrans parameter for toplvl
mounts.