[Rpm-maint] [rpm-software-management/rpm] Failure to read rpmdb from CentOS 7.5.1804 with the bdb_ro backend (#1576)

[Philippe Ombredanne]

To reproduce, this base rootfs for Docker  contains an rpmdb https://github.com/CentOS/sig-cloud-instance-images/blob/CentOS-7.5.1804/docker/centos-7-docker.tar.xz?raw=true 

Then compile rpm with these [configure flags](https://github.com/nexB/scancode-plugins/blob/develop/builtins/rpm_inspector_rpm/build.sh) (I used rpm-4.16.1.2-release, but the latest head should have the same issue)
```
./autogen.sh \
  --enable-static \
  --disable-openmp \
  --enable-bdb=no \
  --enable-bdb-ro=yes \
  --enable-ndb \
  --enable-sqlite=yes \
  --disable-plugins \
  --without-lua  \
  --with-crypto=openssl
```
Then run this rpm command on the extracted rootfs:

```
rpm --query --all --verbose --verbose --dbpath <path to rootfs>/var/lib/rpm

D: Found bdb_ro Packages database: using bdb_ro backend.
D: opening  db index       <path to rootfs>/var/lib/rpm/Packages
D: opening  db index       <path to rootfs>/var/lib/rpm/Name
D: opening  db index       <path to rootfs>/var/lib/rpm/Basenames
D: opening  db index       <path to rootfs>/var/lib/rpm/Group
D: opening  db index       <path to rootfs>/var/lib/rpm/Requirename
D: opening  db index       <path to rootfs>/var/lib/rpm/Providename
D: opening  db index       <path to rootfs>/var/lib/rpm/Conflictname
D: opening  db index       <path to rootfs>/var/lib/rpm/Obsoletename
D: opening  db index       <path to rootfs>/var/lib/rpm/Triggername
D: opening  db index       <path to rootfs>/var/lib/rpm/Dirnames
D: opening  db index       <path to rootfs>/var/lib/rpm/Installtid
D: opening  db index       <path to rootfs>/var/lib/rpm/Sigmd5
D: opening  db index       <path to rootfs>/var/lib/rpm/Sha1header
D: opening  db index       <path to rootfs>/var/lib/rpm/Filetriggername
error: <path to rootfs>/var/lib/rpm/Filetriggername: pread: Bad file descriptor
error: could not open <path to rootfs>/var/lib/rpm/Filetriggername: Bad file descriptor
error: cannot open Filetriggername index using bdb_ro - Operation not permitted (1)
error: cannot open Packages database in <path to rootfs>/var/lib/rpm
```

Basically as pointed to by @Conan-Kudo this RPM was built with 4.11.3 and  Filetriggername appeared circa 4.13
IMHO we should be able to read all rpmdb with bdb_ro that would have this file/magic:
```
$ file <path to rootfs>/var/lib/rpm/*
<path to rootfs>/var/lib/rpm/Basenames:    Berkeley DB (Btree, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/Conflictname: Berkeley DB (Btree, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/__db.001:     Applesoft BASIC program data, first line number 18
<path to rootfs>/var/lib/rpm/__db.002:     a.out little-endian 32-bit pure executable
<path to rootfs>/var/lib/rpm/__db.003:     a.out little-endian 32-bit pure executable not stripped
<path to rootfs>/var/lib/rpm/Dirnames:     Berkeley DB (Btree, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/Group:        Berkeley DB (Btree, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/Installtid:   Berkeley DB (Btree, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/Name:         Berkeley DB (Btree, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/Obsoletename: Berkeley DB (Btree, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/Packages:     Berkeley DB (Hash, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/Providename:  Berkeley DB (Btree, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/Requirename:  Berkeley DB (Btree, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/Sha1header:   Berkeley DB (Btree, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/Sigmd5:       Berkeley DB (Btree, version 9, native byte-order)
<path to rootfs>/var/lib/rpm/Triggername:  Berkeley DB (Btree, version 9, native byte-order)
```

and we should be able to cope with not having all the data files present, such as here  `Filetriggername`

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