xds routing fails when okhttp2.2.0 is used

[daizhenyu]

What happened?

when okhttp2.2.0 used xds router with Sermant router plugin, it cannot find the com.squareup.okhttp.HttpUrl class

How can we reproduce it (as minimally and precisely as possible)?

use okhttp2.2.0 to call service with xds router by Sermant router plugin

Anything else we need to know?

No response

Sermant version

Sermant 2.1.0

OS version

# On Linux:
$ cat /etc/os-release
# paste output here
$ uname -a
# paste output here

# On Windows:
C:\> wmic os get Caption, Version, BuildNumber, OSArchitecture
# paste output here