(Almost) finish porting to JAT

The test body was not properly rewritten.  What still remains, though,
is that we don't have replacement for special RPMs.

src/api/nativity/test

 #!/bin/bash
-# vim: dict+=/usr/share/beakerlib/dictionary.vim cpt=.,w,b,u,t,i,k
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-#
-#   runtest.sh of /CoreOS/preupgrade-assistant/api/nativity
-#   Description: package "nativity" functions
-#   Author: Alois Mahdal <amahdal@redhat.com>
-#
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-#
-#   Copyright (c) 2016 Red Hat, Inc.
-#
-#   This program is free software: you can redistribute it and/or
-#   modify it under the terms of the GNU General Public License as
-#   published by the Free Software Foundation, either version 2 of
-#   the License, or (at your option) any later version.
-#
-#   This program is distributed in the hope that it will be
-#   useful, but WITHOUT ANY WARRANTY; without even the implied
-#   warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
-#   PURPOSE.  See the GNU General Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License
-#   along with this program. If not, see http://www.gnu.org/licenses/.
-#
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 shellfu import jat_dump
 shellfu import preupg
     local pkg=$1
     case $Fn in
         get_dist_native_list)
-            rlRun "grep '$pkg' r_native" \
-                1 "package $pkg not considered native"
+            jat__cmd -h "package $pkg not considered native" \
+                -S 1 \
+                grep "$pkg" r_native
             ;;
         is_dist_native)
-            rlAssertNotEquals \
-                "package $pkg not considered native" \
-                "$(cat r_es)" 0
+            jat__cmp -h "package $pkg not considered native" \
+                "$(cat r_es)" eq 0
             ;;
     esac
 }
     local pkg=$1
     case $Fn in
         get_dist_native_list)
-            rlRun "grep '$pkg' r_native" \
-                0 "package $pkg considered native"
+            jat__cmd -h "package $pkg considered native" \
+                grep "$pkg" r_native
             ;;
         is_dist_native)
-            rlAssertEquals \
-                "package $pkg considered native" \
-                "$(cat r_es)" 0
+            jat__cmp -h "package $pkg considered native" \
+                "$(cat r_es)" eq 0
             ;;
     esac
 }
     # ensure package (non-)presence)
     #
     case $Check in
-        foreign)    rlAssertRpm "$FOREIGN"  ;;
-        native)     rlAssertRpm "$NATIVE"   ;;
-        ninst)      rlAssertNotRpm "$NINST" ;;
+        foreign)    jat__cmd rpm -q "$FOREIGN"  ;;
+        native)     jat__cmd rpm -q "$NATIVE"   ;;
+        ninst)      jat__cmd -S 1 rpm -q "$NINST" ;;
     esac
 
     # collect data
     # do the test
     #
     case $Check in
-        diff)       rlRun "diff -U 1 o_native r_native > r_diff" \
-                        0 "native list is same as expected" \
+        diff)       jat__cmd -h "native list is same as expected" \
+                        -o r_diff \
+                        diff -U 1 o_native r_native \
                      || jat_dump__file -E r_diff ;;
         native)     assert_native  "$NATIVE"     ;;
         excluded)   assert_foreign "$EXCLUDED"   ;;