redhat: Verify rpm package signature.

[shoebill]

Take into account the main readme for this section. README first.

$ rpm -K hello-world-1-1.x86_64.rpm 
hello-world-1-1.x86_64.rpm: rsa sha1 (md5) pgp md5 OK

For more information.

$ rpm -Kv hello-world-1-1.x86_64.rpm 
hello-world-1-1.x86_64.rpm:
    Header V3 RSA/SHA256 Signature, key ID d430dcc9: OK
    Header SHA1 digest: OK (c96e80e05c5b168161928b18374d9cf751340c5c)
    V3 RSA/SHA256 Signature, key ID d430dcc9: OK
    MD5 digest: OK (cc9769af80499739ef2d268efaad944b)

Even more information.

$ rpm -Kvv hello-world-1-1.x86_64.rpm