Merge branch 'nd/init-relative-template-fix' into maint

A relative pathname given to "git init --template=<path> <repo>"
ought to be relative to the directory "git init" gets invoked in,
but it instead was made relative to the repository, which has been
corrected.

* nd/init-relative-template-fix:
init: make --template path relative to $CWD

diff --cc builtin/init-db.c
Simple merge

diff --cc t/t0001-init.sh
Simple merge