tree e1643fc3290a36db3e66f20487eb59a62f9f6bbc
parent e0e2cce95a5fad8431d4c40f81519447af8e701f
author Nan Zhou <nanzhoumails@gmail.com> 1638485777 -0800
committer Nan Zhou <nanzhoumails@gmail.com> 1639695107 -0800

remove year 2038 check

https://gerrit.openbmc-project.xyz/c/openbmc/bmcweb/+/49188 resolves
the year 2038 problem in BMCWeb. There's no need to check it in
cert-manager anymore. However, the current Cert interface can't take
certificate whose NotBefore is before the Unix Epoch given the
timestamp is uint64_t. So this change adds the check to return
errors in this case.

This change also fixed the existing issue of setting unix epoch.

TESTED: unit tests + QEMU
1. added a cert that's valid from 1970/01/01 to 9999/12/31 into
 unit tests
2. tested the dbus properties in QEMU after installing the above
 cert;

```
.ValidNotAfter                        property  t         253402300799                             emits-change writable
.ValidNotBefore                       property  t         0                                        emits-change writable
```
This is expected.

Signed-off-by: Nan Zhou <nanzhoumails@gmail.com>
Change-Id: Idc6b7721fc84b6b9022467e6b0c9e1984f682912