cifs: client: stage smb3_reconfigure() updates and restore ctx on failure

smb3_reconfigure() moves strings out of cifs_sb->ctx before the
multichannel update, so a later failure can leave the live context
with NULL strings or options that do not match the session.

Stage the new ctx separately, commit it only on success, and restore
the snapshot on failure. Also make smb3_sync_session_ctx_passwords()
all-or-nothing.

Commit session passwords before channel updates so newly added channels
authenticate with the staged credentials.

Fixes: ef529f655a2c ("cifs: client: allow changing multichannel mount options on remount")
Reported-by: RAJASI MANDAL <rajasimandalos@gmail.com>
Closes: https://lore.kernel.org/lkml/CAEY6_V1+dzW3OD5zqXhsWyXwrDTrg5tAMGZ1AJ7_GAuRE+aevA@mail.gmail.com/
Link: https://lore.kernel.org/lkml/xkr2dlvgibq5j6gkcxd3yhhnj4atgxw2uy4eug2pxm7wy7nbms@iq6cf5taa65v/
Reviewed-by: Henrique Carvalho <henrique.carvalho@suse.com>
Signed-off-by: DaeMyung Kang <charsyam@gmail.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

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