Add rotate support if the space is full

delete the first existing file if the space is not enough

Tested:
1. create dump and make the space is not enough
busctl call xyz.openbmc_project.Dump.Manager /xyz/openbmc_project/dump/bmc xyz.openbmc_project.Dump.Create CreateDump a{sv} 0
busctl tree xyz.openbmc_project.Dump.Manager                                                                        `-/xyz
  `-/xyz/openbmc_project
    `-/xyz/openbmc_project/dump
      |-/xyz/openbmc_project/dump/bmc
      | `-/xyz/openbmc_project/dump/bmc/entry
      |   |-/xyz/openbmc_project/dump/bmc/entry/10
      |   |-/xyz/openbmc_project/dump/bmc/entry/6
      |   |-/xyz/openbmc_project/dump/bmc/entry/7
      |   |-/xyz/openbmc_project/dump/bmc/entry/8
      |   `-/xyz/openbmc_project/dump/bmc/entry/9
      `-/xyz/openbmc_project/dump/internal
        `-/xyz/openbmc_project/dump/internal/manager

2. create dump again and the the first existing file will be deleted

Signed-off-by: Xie Ning <xiening.xll@bytedance.com>
Change-Id: Ic3b376d7e6512a264f849de760363f4e167421c7