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

scripts/dkms.mkconf

@@ -40,10 +40,6 @@ PRE_BUILD="configure
       then
         echo --enable-debug
       fi
-      if [[ \${ZFS_DKMS_ENABLE_DMU_TX,,} == @(y|yes) ]]
-      then
-        echo --enable-debug-dmu-tx
-      fi
     }
   )
 "
@@ -86,10 +82,7 @@ DEST_MODULE_LOCATION[3]="/extra/zcommon/zcommon"
 BUILT_MODULE_NAME[4]="zfs"
 BUILT_MODULE_LOCATION[4]="module/zfs/"
 DEST_MODULE_LOCATION[4]="/extra/zfs/zfs"
-BUILT_MODULE_NAME[5]="zpios"
-BUILT_MODULE_LOCATION[5]="module/zpios/"
-DEST_MODULE_LOCATION[5]="/extra/zpios/zpios"
-BUILT_MODULE_NAME[6]="icp"
-BUILT_MODULE_LOCATION[6]="module/icp/"
-DEST_MODULE_LOCATION[6]="/extra/icp/icp"
+BUILT_MODULE_NAME[5]="icp"
+BUILT_MODULE_LOCATION[5]="module/icp/"
+DEST_MODULE_LOCATION[5]="/extra/icp/icp"
 EOF