Support rpm (jbj rpm 4.4.7+) hrmib exports for rpm -qa filter (via %_hrmib_path /var/cache/hrmib)

Not accepted upstream.

--
Signed-off-by: Elan Ruusamäe <glen@delfi.ee>

--- bash-completion-2.0/completions/rpm.orig	2012-01-07 23:44:41.000000000 +0100
+++ bash-completion-2.0/completions/rpm	2012-07-28 07:21:12.033708931 +0200
@@ -4,6 +4,12 @@
 
 _rpm_installed_packages()
 {
+    # if rpm (4.4.7+) is configured to export it's rpmdb to /var/cache/hrmib (%_hrmib_path)
+    if [ -d /var/cache/hrmib -a -r /var/cache/hrmib ]; then
+        COMPREPLY=( $( LC_ALL=C command ls -1 /var/cache/hrmib | sed -ne '/^'$cur'/p') )
+        return
+    fi
+
     if [[ -r /var/log/rpmpkgs && \
         /var/log/rpmpkgs -nt /var/lib/rpm/Packages ]]; then
         # using RHL 7.2 or later - this is quicker than querying the DB