rebase: stop setting GIT_REFLOG_ACTION

This is a follow up to pw/rebase-reflog-fixes that moves away from using GIT_REFLOG_ACTION internally.

Thanks to Taylor & Ævar for their comments on V1. I've updated the commit message of patch 1 as suggested by Taylor, the code is unchanged.

Phillip Wood (2):
sequencer: stop exporting GIT_REFLOG_ACTION
rebase: stop exporting GIT_REFLOG_ACTION

 builtin/rebase.c | 27 +++++++++++++++------------
 sequencer.c      | 45 +++++++++++++++++++++++++--------------------
 sequencer.h      |  6 ++++++
 3 files changed, 46 insertions(+), 32 deletions(-)

base-commit: 3b08839926fcc7cc48cf4c759737c1a71af430c1
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1405%2Fphillipwood%2Fmore-rebase-reflog-fixes-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1405/phillipwood/more-rebase-reflog-fixes-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/1405

Range-diff vs v1:

1: e9c3f5ac5c6 ! 1: 655b4e89f59 sequencer: stop exporting GIT_REFLOG_ACTION
@@ Commit message
pass the reflog action around in a variable and use it to set GIT_REFLOG_ACTION in the child environment when running "git commit".

+ Within the sequencer GIT_REFLOG_ACTION is no longer set and is only read
+ by sequencer_reflog_action(). It is still set by rebase before calling
+ the sequencer, that will be addressed in the next commit. cherry-pick
+ and revert are unaffected as they do not set GIT_REFLOG_ACTION before
+ calling the sequencer.
+

## sequencer.c ##
2: d3747bcc8d1 = 2: 31df037eafe rebase: stop exporting GIT_REFLOG_ACTION

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