graft: reuse the --log value passed initially in `hg graft --continue` (BC) We now stores the value of --log flag passed initially in the graftstate and reuse that value when doing `hg graft --continue` which is a nice behavior. The test updates demonstrate the fix. Since we now preserve the value by default, drop the mention of `--log` flag from the hint which we see after conflicts. Differential Revision: https://phab.mercurial-scm.org/D3662

graft: add test showing --continue not preserving --log passed earlier This patch shows that when we do `hg graft --continue`, the value of --log flag passed when initial graft was run was not used. Next patch will fix this and tests will help us in realising that. Differential Revision: https://phab.mercurial-scm.org/D3661