Retire legacy test infrastructure

* Removed zpios kmod, utility, headers and man page.

* Removed unused scripts zpios-profile/*, zpios-test/*,
  zpool-config/*, smb.sh, zpios-sanity.sh, zpios-survey.sh,
  zpios.sh, and zpool-create.sh.

* Removed zfs-script-config.sh.in.  When building 'make' generates
  a common.sh with in-tree path information from the common.sh.in
  template.  This file and sourced by the test scripts and used
  for in-tree testing, it is not included in the packages.  When
  building packages 'make install' uses the same template to
  create a new common.sh which is appropriate for the packaging.

* Removed unused functions/variables from scripts/common.sh.in.
  Only minimal path information and configuration environment
  variables remain.

* Removed unused scripts from scripts/ directory.

* Remaining shell scripts in the scripts directory updated to
  cleanly pass shellcheck and added to checked scripts.

* Renamed tests/test-runner/cmd/ to tests/test-runner/bin/ to
  match install location name.

* Removed last traces of the --enable-debug-dmu-tx configure
  options which was retired some time ago.

Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #6509

rpm/generic/zfs-kmod.spec.in

@@ -37,7 +37,6 @@
 #define buildforkernels akmod
 
 %bcond_with     debug
-%bcond_with     debug_dmu_tx
 
 
 Name:           %{module}-kmod
@@ -117,12 +116,6 @@ bash %{SOURCE10}  --target %{_target_cpu} %{?repo:--repo %{?repo}} --kmodname %{
     %define debug --disable-debug
 %endif
 
-%if %{with debug_dmu_tx}
-    %define debug_dmu_tx --enable-debug-dmu-tx
-%else
-    %define debug_dmu_tx --disable-debug-dmu-tx
-%endif
-
 #
 # Allow the overriding of spl locations
 #
@@ -163,8 +156,7 @@ for kernel_version in %{?kernel_versions}; do
         --with-linux-obj=%{kobj} \
         --with-spl="%{spldir}" \
         --with-spl-obj="%{splobj}" \
-        %{debug} \
-        %{debug_dmu_tx}
+        %{debug}
     make %{?_smp_mflags}
     cd ..
 done