Bind/Overlay device fix

[jchristianh]

For hosts running services such as Docker or named-chroot, bind/overlay mounts
are created under an existing device node. This has the result reporting multiple
results for the mount point existence assertion, which ultimately causes a
failure due to accepting only a single result.

This set of updates changes the logic to support these hosts.

Below are outputs from the mount command and ansible_facts['mounts']
from an example host running both of these services.

Output from mount:

/dev/mapper/system-root on / type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/named/chroot/etc/localtime type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/named/chroot/etc/named.root.key type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/named/chroot/etc/named.conf type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/named/chroot/etc/named.rfc1912.zones type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/named/chroot/etc/rndc.key type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/named/chroot/etc/named.iscdlv.key type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/named/chroot/etc/protocols type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/named/chroot/etc/services type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/named/chroot/etc/named type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/named/chroot/usr/lib64/bind type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/named/chroot/var/named type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/lib/docker/containers type ext4 (rw,relatime,seclabel,data=ordered)
/dev/mapper/system-root on /var/lib/docker/overlay2 type ext4 (rw,relatime,seclabel,data=ordered)

Truncated example output from ansible_facts['mounts']:

        {
            "block_available": 16410821,
            "block_size": 4096,
            "block_total": 18245904,
            "block_used": 1835083,
            "device": "/dev/mapper/system-root",
            "fstype": "ext4",
            "inode_available": 4582572,
            "inode_total": 4644864,
            "inode_used": 62292,
            "mount": "/",
            "options": "rw,seclabel,relatime,data=ordered",
            "size_available": 67218722816,
            "size_total": 74735222784,
            "uuid": "588943e8-02c5-429b-a8d4-1b6ff390b051"
        },
        {
            "block_available": 16410821,
            "block_size": 4096,
            "block_total": 18245904,
            "block_used": 1835083,
            "device": "/dev/mapper/system-root",
            "fstype": "ext4",
            "inode_available": 4582572,
            "inode_total": 4644864,
            "inode_used": 62292,
            "mount": "/var/lib/docker/overlay2",
            "options": "rw,seclabel,relatime,data=ordered,bind",
            "size_available": 67218722816,
            "size_total": 74735222784,
            "uuid": "588943e8-02c5-429b-a8d4-1b6ff390b051"
        },
        {
            "block_available": 16410821,
            "block_size": 4096,
            "block_total": 18245904,
            "block_used": 1835083,
            "device": "/dev/mapper/system-root",
            "fstype": "ext4",
            "inode_available": 4582572,
            "inode_total": 4644864,
            "inode_used": 62292,
            "mount": "/var/named/chroot/var/named",
            "options": "rw,seclabel,relatime,data=ordered,bind",
            "size_available": 67218722816,
            "size_total": 74735222784,
            "uuid": "588943e8-02c5-429b-a8d4-1b6ff390b051"
        },

[ygalblum]

LGTM