gpg: Use the matching key if the search description is exact.

* g10/gpg.c (check_user_ids): If the search description is for an
exact match (a keyid or fingerprint that ends in '!'), then use the
matching key, not the primary key.
* tests/openpgp/Makefile.am (TESTS): Add use-exact-key.test.
(priv_keys): Add privkeys/00FE67F28A52A8AA08FFAED20AF832DA916D1985.asc,
privkeys/1DF48228FEFF3EC2481B106E0ACA8C465C662CC5.asc,
privkeys/A2832820DC9F40751BDCD375BB0945BA33EC6B4C.asc,
privkeys/ADE710D74409777B7729A7653373D820F67892E0.asc and
privkeys/CEFC51AF91F68A2904FBFF62C4F075A4785B803F.asc.
(sample_keys): Add
samplekeys/E657FB607BB4F21C90BB6651BC067AF28BC90111.asc.
* tests/openpgp/privkeys/00FE67F28A52A8AA08FFAED20AF832DA916D1985.asc:
New file.
* tests/openpgp/privkeys/1DF48228FEFF3EC2481B106E0ACA8C465C662CC5.asc:
New file.
* tests/openpgp/privkeys/A2832820DC9F40751BDCD375BB0945BA33EC6B4C.asc:
New file.
* tests/openpgp/privkeys/ADE710D74409777B7729A7653373D820F67892E0.asc:
New file.
* tests/openpgp/privkeys/CEFC51AF91F68A2904FBFF62C4F075A4785B803F.asc:
New file.
* tests/openpgp/samplekeys/E657FB607BB4F21C90BB6651BC067AF28BC90111.asc:
New file.
* tests/openpgp/use-exact-key.test: New file.
* tests/openpgp/version.test: Install the new private keys.

--
Signed-off-by: Neal H. Walfield <neal@g10code.com>
Reported-by: Reported-by: Kristian Fiskerstrand
  <kristian.fiskerstrand@sumptuouscapital.com>
Fixes-commit: 10cca02

tests/openpgp/privkeys/00FE67F28A52A8AA08FFAED20AF832DA916D1985.asc

@@ -0,0 +1,17 @@
+-----BEGIN PGP ARMORED FILE-----
+Version: GnuPG v2
+Comment: Use "gpg --dearmor" for unpacking
+
+KDExOnByaXZhdGUta2V5KDM6cnNhKDE6bjEyOToAqCYxh+c0mGKVkNRLiSe19rSb
+OgLVJcL6dH1EnawO6klyypIbrDom7DNNTlp7TMlwQ+UsKbmT8jwkU08/awg6W9Wq
+5LCABUStYrVcwJJlf3p4lBru0BSRlaKuIslpk5Powfj2lPXX6o1eRHsnxk9FTD+M
+GcWkhfL9HF+Rq8vPcicpKDE6ZTM6AQABKSgxOmQxMjg6NPUmd199hJrT8TOzgIRl
+vkfedZRLziNM3yBO2nvEjMxKH3uJxKHh/VUg/VLo72On/HIyiQeeDVYcuLJGTm7e
+degk/9C85hT5K4VUF9+LXXDX1Vz/jQdZxq+JwUE/AdlAEC9fkFQzc0ftI832mgjR
+OASwMVphqYUQERz00ve+NDUpKDE6cDY1OgDJoHlM5kAfmQ3HQsykH2QoWnxA6mTa
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+clqSismtIwvuCV3wMAQMIUr+OWTlGHOCYa8FnBn7PbE6TevGdDEE8CQcfCkpKQ==
+=AhP7
+-----END PGP ARMORED FILE-----

tests/openpgp/privkeys/1DF48228FEFF3EC2481B106E0ACA8C465C662CC5.asc

@@ -0,0 +1,23 @@
+-----BEGIN PGP ARMORED FILE-----
+Version: GnuPG v2
+Comment: Use "gpg --dearmor" for unpacking
+
+KDIxOnByb3RlY3RlZC1wcml2YXRlLWtleSgzOnJzYSgxOm4xMjk6AOnl30hwc47r
+LL9QH6g0TX1BEPdWMV4Ou6+rQOErIMAr1AOlUzpjwJllvQqf2OHnQWaTr9kbNLn7
+XUEUhjkH3uHDYMHMdyAb7YJrk3ECDqnmr34VV/F/H5BH7D6AiFktl1SpUTczPxBx
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+NDpvcGVucGdwLW5hdGl2ZSgxOTpvcGVucGdwLXByaXZhdGUta2V5KDc6dmVyc2lv
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+th4MOeykeGRRMagJI420QTE6XzY1OgDzN2Pz0dRD20hHKF6eiqAZYaZhmA7pKWuW
+jHCVXO9s6zGfn0Ds+kTQJltOxU/AULATN/ffXqTtXSiprxNUvwnbMTpfNjU6APYx
+GOABYcWOpJn35eSoisB04QtOgT5OpAl/dLbeaJ+Yh9KtrY6wLf/mX03FgE+YbkIf
+TmeB6tDf4RYbXCYyKJExOl82NDo5wagaIbek0F5TRtmqdVk1weEk/0XXdyG/mNIA
+4l/qt/LHcduBN46qHYEKnKhyDMCBDwlSRf455FG8Oi1x+JMYKSg0OmNzdW01OjQx
+MDUyKSgxMDpwcm90ZWN0aW9uNDpub25lKSkpKSk=
+=hX0p
+-----END PGP ARMORED FILE-----

tests/openpgp/privkeys/A2832820DC9F40751BDCD375BB0945BA33EC6B4C.asc

@@ -0,0 +1,17 @@
+-----BEGIN PGP ARMORED FILE-----
+Version: GnuPG v2
+Comment: Use "gpg --dearmor" for unpacking
+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==
+=dUou
+-----END PGP ARMORED FILE-----

tests/openpgp/privkeys/ADE710D74409777B7729A7653373D820F67892E0.asc

@@ -0,0 +1,17 @@
+-----BEGIN PGP ARMORED FILE-----
+Version: GnuPG v2
+Comment: Use "gpg --dearmor" for unpacking
+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+HLkQzUyi2HnrXJ224cjvgc312wvtBQMUyLARWuEuMVMAwWofjX+GZXLz0ikpKQ==
+=Rw+Y
+-----END PGP ARMORED FILE-----

tests/openpgp/privkeys/CEFC51AF91F68A2904FBFF62C4F075A4785B803F.asc

@@ -0,0 +1,17 @@
+-----BEGIN PGP ARMORED FILE-----
+Version: GnuPG v2
+Comment: Use "gpg --dearmor" for unpacking
+
+KDExOnByaXZhdGUta2V5KDM6cnNhKDE6bjEyOToAvkUCG0xYaTIkZiTwd1wCUF8a
+Q2+YdrBGjSfzCyB8DzbPozYA29eOAayDg9RuesQGISmFQ6YRSINsAogdNfZmKu8j
+VMp/2mRQR6necW4OKkdtdnAI8B6Qaj/clBJt990RahXcrXG13fa0n72TpRbxmUUs
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+isGpweGpp1T+4L+DiXMMAbhFW60gdqqo4+vzkn2M/M/8BPrKCw1TlDn3TSkpKQ==
+=lYo+
+-----END PGP ARMORED FILE-----