directive sysguard_load load support auto

[wozhengjl]

sysguard_load load=auto scale=1.2 action=/loadlimit;

[wozhengjl]

sysguard_load load=auto action=/loadlimit;

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

zhengjianlei seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}