client: re-send requsets before composing the cap reconnect message

client: re-send requsets before composing the cap reconnect message

After commit 419800fe (client: re-send request when MDS enters reconnecting
stage), cephfs client can send both unsafe requests and normal requests when
MDS is in reconnecting stage. Normal requests can have embedded cap releases,
the client code encodes these embedded cap releases after composing the cap
reconnect message. This causes the client sliently drop some caps. The fix
is re-send requsets (which add embedded cap releases) before composing the
cap reconnect message

Fixes: #10912
Signed-off-by: Yan, Zheng <zyan@redhat.com>