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/samplekeys/E657FB607BB4F21C90BB6651BC067AF28BC90111.asc

@@ -0,0 +1,45 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v2
+
+mI0EVl9ZyAEEAL5FAhtMWGkyJGYk8HdcAlBfGkNvmHawRo0n8wsgfA82z6M2ANvX
+jgGsg4PUbnrEBiEphUOmEUiDbAKIHTX2ZirvI1TKf9pkUEep3nFuDipHbXZwCPAe
+kGo/3JQSbffdEWoV3K1xtd32tJ+9k6UW8ZlFLGOCkaWwkZuOK0fQAFj7ABEBAAG0
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+mAQetr258lPrcUOZ86xhpy9dacLRFf+Uk0R3nYSbYHFFht64NQFv2dvH6XaR1DfS
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+g0xJUiTnftweF8J5rZwVueCpUeNjy6G7ABEBAAGInwQYAQgACQUCVl9blQIbDAAK
+CRC8Bnryi8kBESPWA/4gTmke4A3gieDvSRWCzQ5IFkr7B+4niPy6Qitlwmvy7Wdr
+xNSlZJpSN1UBBurIH4wcPV7nlKMuv60eb00llaBSH1HgAfcbyv35EC39Cgz5Ffaf
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+OZSqAC5pVGPYCcXie7mx1k+5DrnQUgaf11zdvzI=
+=Htgs
+-----END PGP PUBLIC KEY BLOCK-----

tests/openpgp/samplekeys/README

@@ -13,3 +13,4 @@ dda252ebb8ebe1af-2.asc rsa4096 key 2 with a long keyid collision.
 whats-new-in-2.1.asc   Collection of sample keys.
 e2e-p256-1-clr.asc     Google End-end-End test key (no protection)
 e2e-p256-1-prt.asc     Ditto, but protected with passphrase "a".
+E657FB607BB4F21C90BB6651BC067AF28BC90111.asc Key with subkeys (no protection)