Keys migrate failed

[dreamer-zq]

Summary of Bug

Version

Gaia3.0

gaiad version --long

output:

name: gaia
server_name: gaiad
version: 3.0.0
commit: d974b27a8caf8cad3b06fbe4678871e4b0b69a51
build_tags: netgo,ledger
go: go version go1.15.6 darwin/amd64
....

Gaia2.0.14

gaiacli version --long

output:

name: gaia
server_name: gaiad
client_name: gaiacli
version: 2.0.14
commit: 86343f24f39dbc800922e5fb296b77b9d30ebaae
build_tags: netgo,ledger
go: go version go1.15.6 darwin/amd64

Steps to Reproduce

1. use gaia2.0.14 to generate a new key

        gaiacli keys add t1 --home ./gaia_test

2. use gaia3.0 to migrate keys from old db file

        gaiad keys migrate --home ./gaia_test

output:

Migrating key: 't1 (local)' ...
Skip key migration? [y/N]: N
Enter passphrase to decrypt key:
Error: unrecognized armor type "TENDERMINT PRIVATE KEY", expected: "TENDERMINT KEY INFO"

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[dreamer-zq]

I found that when exporting private, I used TENDERMINT PRIVATE KEY, location:

cosmos-sdk/client/keys/migrate.go

Line 125 in 046b1a4

armoredPriv, err := legacyKb.ExportPrivKey(keyName, password, migratePassphrase)

, but when importing keyring, Check with TENDERMINT KEY INFO is used. location:

cosmos-sdk/crypto/armor.go

Line 73 in 046b1a4

bz, header, err := unarmorBytes(armorStr, blockTypeKeyInfo)

[amaury1093]

I believe this is solved by #8639