Merge branch 'st/verify-tag'

"git tag" and "git verify-tag" learned to put GPG verification
status in their "--format=<placeholders>" output format.

* st/verify-tag:
t/t7004-tag: Add --format specifier tests
t/t7030-verify-tag: Add --format specifier tests
builtin/tag: add --format argument for tag -v
builtin/verify-tag: add --format to verify-tag
ref-filter: add function to print single ref_array_item
gpg-interface, tag: add GPG_VERIFY_OMIT_STATUS flag

diff --cc Documentation/git-tag.txt
Simple merge

diff --cc builtin/tag.c
Simple merge

diff --cc ref-filter.c
Simple merge

diff --cc ref-filter.h
Simple merge

diff --cc t/t7004-tag.sh
Simple merge