go build failed #1151
Description
Bug Report
This project can not compile under go1.15.10
logkit 相关配置：
none
运行环境:
go1.15.10
logkit 版本：
master
操作系统版本：
Ubuntu 20.04.2 LTS
复现过程操作步骤：
make all failed with the following error:
$ make all
go generate
tools/generators/grok_pattern_generator.go:13:2: cannot find package "github.com/qiniu/log" in any of:
/usr/local/go/src/github.com/qiniu/log (from $GOROOT)
/home/ubuntu/go/src/github.com/qiniu/log (from $GOPATH)
logkit.go:235: running "go": exit status 1
make: *** [Makefile:2: all] Error 1
Cause: It seems the project https://github.com/qiniu/log is not public available anymore
预期表现：
should compile the project and generate a binary as output
实际情况：
go build failed