dahdi_genconf: Do not fail if pinned/assigned span utilities were not installed.

If you installed dahdi tools and did not specify DAHDI_PINNED=yes on the
makefile, when you run dahdi_genconf you would get an error like the following:

  # dahdi_genconf
  sh: span_types: command not found
  Command failed (status=32512): 'span_types dumpconfig > /etc/dahdi/span-types.conf' at ...

This change allows the generator for span-types.conf and span-assignements.conf
check for the existence of the utilities before attempting to call them.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>

xpp/perl_modules/Dahdi/Config/Gen/Pinnedspans.pm

@@ -23,6 +23,12 @@ sub generate($$$) {
 	my $gconfig = $self->{GCONFIG};
 	my $genopts = $self->{GENOPTS};
 	my @spans = @_;
+
+	# If the span_types utilities were not installed we do not want to run
+	# this generator or report any errors.
+	system "which span_assignments > /dev/null 2>&1";
+	return if $?;
+
 	warn "Empty configuration -- no spans\n" unless @spans;
 	rename "$file", "$file.bak"
 		or $! == 2	# ENOENT (No dependency on Errno.pm)

xpp/perl_modules/Dahdi/Config/Gen/Spantypes.pm

@@ -23,6 +23,12 @@ sub generate($$$) {
 	my $gconfig = $self->{GCONFIG};
 	my $genopts = $self->{GENOPTS};
 	my @spans = @_;
+
+	# If the span_types utilities were not installed we do not want to run
+	# this generator or report any errors.
+	system "which span_types > /dev/null 2>&1";
+	return if $?;
+
 	warn "Empty configuration -- no spans\n" unless @spans;
 	rename "$file", "$file.bak"
 		or $! == 2	# ENOENT (No dependency on Errno.pm)