autofs-5.0.8 - fix undefined authtype_requires_creds err if ldap enabled but without sasl

This patch is moving "WITH_SASL" into authtype_requires_creds function
make it return 0 if sasl not enabled, which mean authtype_requires_creds is not enabled

https://bugs.gentoo.org/show_bug.cgi?id=489128
autofs-5.0.8 - fix master map type check

Map type has format <type>[,<format>] but the master map type check
for old style map syntax doesn't allow for <format>.
autofs-5.0.8 - fix task manager not getting signaled

If a task is added and the task list isn't empty and in progress
tasks depend on the new task completion the task manager doesn't
get signaled.
autofs-5.0.8 - allow --with-systemd to take a path arg

If building for a cross-compile environment with systemd it is convenient
to be able to specify a systemd path for the target that may not be the
same as that on the host.

I encountered a problem while working with autofs in a cross-compile
environment where the host and target have either differing systemd paths
or where one may not have systemd support at all.  The common solution
I've seen in other projects is to have a --with-systemddir=[path] option,
but I thought it'd be simpler to add an optional path argument to the
extant '--with-systemd' configure parameter and leave the default =y+probe
for path logic in place.

Signed-off-by: Joe MacDonald <joe@deserted.net>
autofs-5.0.8 - fix WITH_LIBTIRPC function name

autoconf function names AM_<name> are reserved so don't use them.
autofs-5.0.8 - fix ipv6 libtirpc getport

The method that was being used to obtain a service port number
when using libtirpc was wrong.
autofs-5.0.8 - fix allow with systemd to take a path arg

And update configure ..