reset rreq time every time we reuse a rreq

[Besroy]

The applier_create_req function will insert rreq to m_repl_key_req_map at the first time, then it try to allocate local blks, and if failed to allocate blks, the rreq will not be removed until gc. And if we retry to create req again, the rreq will be reused without update for the timer, which may hit the following issue:

T1: failed to alloc blk for data while receiving it from data channel
T2: recevied log from raft channel and reuse rreq
T3: gc, the corresponding rreq is removed (raft channel is lower than data channel since there are lots of create/seal shard req)
T4: append process cannot find rreq at localize_journal_entry_finish and try to prepare rreq again, so the rreq is new but the entry is old, leading mismatch.

So we reset timer for rreq every time we reuse it.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.98%. Comparing base (1a0cef8) to head (52e5323).
Report is 113 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #618      +/-   ##
==========================================
+ Coverage   56.51%   65.98%   +9.46%     
==========================================
  Files         108      109       +1     
  Lines       10300    10985     +685     
  Branches     1402     1509     +107     
==========================================
+ Hits         5821     7248    +1427     
+ Misses       3894     3012     -882     
- Partials      585      725     +140     

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