tests: create gpg homedir on the fly

GnuPG 2.1 homedir looks different, so just create it on the fly by
importing needed private and public keys and ownertrust.

This solves an issue with gnupg 2.1 running interactive pinentry
when old secret key is present.

Signed-off-by: Christian Hesse <mail@eworm.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/lib-gpg.sh

@@ -16,11 +16,15 @@ else
 		# Type DSA and Elgamal, size 2048 bits, no expiration date.
 		# Name and email: C O Mitter <committer@example.com>
 		# No password given, to enable non-interactive operation.
-		cp -R "$TEST_DIRECTORY"/lib-gpg ./gpghome
-		chmod 0700 gpghome
-		chmod 0600 gpghome/*
+		mkdir ./gpghome
+		chmod 0700 ./gpghome
 		GNUPGHOME="$(pwd)/gpghome"
 		export GNUPGHOME
+		gpg --homedir "${GNUPGHOME}" --import \
+			"$TEST_DIRECTORY"/lib-gpg/pubring.gpg \
+			"$TEST_DIRECTORY"/lib-gpg/secring.gpg
+		gpg --homedir "${GNUPGHOME}" --import-ownertrust \
+			"$TEST_DIRECTORY"/lib-gpg/ownertrust
 		test_set_prereq GPG
 		;;
 	esac

t/lib-gpg/ownertrust

@@ -0,0 +1,4 @@
+# List of assigned trustvalues, created Thu 11 Dec 2014 01:26:28 PM CET
+# (Use "gpg --import-ownertrust" to restore them)
+73D758744BE721698EC54E8713B6F51ECDDE430D:6:
+D4BE22311AD3131E5EDA29A461092E85B7227189:3: