autoconf: use include directives instead of recursing down contrib

Also make the pyzfs build actually out-of-tree and quiet by default

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Co-authored-by: Rapptz <rapptz@gmail.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13316

contrib/initramfs/Makefile.am

@@ -1,11 +1,39 @@
-include $(top_srcdir)/config/Shellcheck.am
+i_tdir = /usr/share/initramfs-tools
+dist_i_t_SCRIPTS = \
+	%D%/zfsunlock
 
-initrddir = /usr/share/initramfs-tools
 
-dist_initrd_SCRIPTS = \
-	zfsunlock
+i_t_confhooks_ddir = $(i_tdir)/conf-hooks.d
+dist_i_t_confhooks_d_DATA = \
+	%D%/conf-hooks.d/zfs
 
-SUBDIRS = conf.d conf-hooks.d hooks scripts
-SHELLCHECKDIRS = hooks scripts
 
-EXTRA_DIST = README.md
+i_t_conf_ddir = $(i_tdir)/conf.d
+dist_i_t_conf_d_DATA = \
+	%D%/conf.d/zfs
+
+
+i_t_hooksdir = $(i_tdir)/hooks
+i_t_hooks_SCRIPTS = \
+	%D%/hooks/zfs \
+	%D%/hooks/zfsunlock
+
+SUBSTFILES += $(i_t_hooks_SCRIPTS)
+
+
+i_t_scriptsdir = $(i_tdir)/scripts
+dist_i_t_scripts_SCRIPTS = \
+	%D%/scripts/zfs
+
+
+i_t_scripts_localtopdir = $(i_t_scriptsdir)/local-top
+dist_i_t_scripts_localtop_SCRIPTS = \
+	%D%/scripts/local-top/zfs
+
+
+i_t_check_scripts    = $(dist_i_t_SCRIPTS) $(i_t_hooks_SCRIPTS) $(dist_i_t_scripts_SCRIPTS) $(dist_i_t_scripts_localtop_SCRIPTS)
+SHELLCHECKSCRIPTS   += $(i_t_check_scripts)
+$(call SHELLCHECK_OPTS,$(i_t_check_scripts)): SHELLCHECK_SHELL = sh
+
+
+EXTRA_DIST += $(addprefix %D%/,README.md)