improvement: update default value for wait time

improvement: limits the SharedInformerFactory to the specified namespace

improvement: alibaba#128 update default image pull policy

Merge branch 'master' into releases/v0.0.13

* master:

ci: use build flag as app version

ci: fix kubectl-connnect archives

Merge pull request alibaba#115 from alfadb/release-0.0.12

自动生成.envrc文件，包括KUBERNETES_NAMESPACE环境变量

update Ktctl version to kt-0.0.11

Merge pull request alibaba#71 from aaa8825121/master

quick start example doc issue.

update quick start docs