Merge branch 'rs/strbuf-add-oid-hex' into jch

Formatting object name in full hexadecimal form has been optimized
by using a new strbuf_add_oid_hex() helper function.

* rs/strbuf-add-oid-hex:
  hex: add and use strbuf_add_oid_hex()

diff --cc bisect.c
Simple merge

diff --cc builtin/bisect.c
Simple merge

diff --cc builtin/cat-file.c
Simple merge

diff --cc pretty.c
Simple merge

diff --cc refs.c
Simple merge

diff --cc sequencer.c
Simple merge

diff --cc shallow.c
Simple merge

diff --cc transport-helper.c
Simple merge