remove "/.oldroot" from mount source
remove "/.oldroot" from mount source

before patch:
root@test-container-multi:/# mount
/dev/sdb on / type xfs (rw,relatime,attr2,inode64,logbsize=64k,sunit=128,swidth=128,noquota)
/.oldroot/dev/sda on /var/log type ext4 (rw,relatime,stripe=16,data=ordered)

after patch:
root@test-container-multi:/# mount
/dev/sdb on / type xfs (rw,relatime,attr2,inode64,logbsize=64k,sunit=128,swidth=128,noquota)
/dev/sda on /var/log type ext4 (rw,relatime,stripe=16,data=ordered)

Signed-off-by: Lai Jiangshan <b337eedf453972390e4695e362aeea2634ef4e0c@gmail.com>

gnawux/hyperstart,gao-feng/hyperstart,MarioCarrilloA/hyperstart,gnawux/hyperstart,hyperhq/hyperstart,MarioCarrilloA/hyperstart,laijs/hyperstart,bergwolf/hyperstart,bergwolf/hyperstart,gao-feng/hyperstart,gnawux/hyperstart,hyperhq/hyperstart,laijs/hyperstart,MarioCarrilloA/hyperstart