MDEV-28592 disks plugin - getmntinfo (BSD) & getmntent (AIX)
Thanks to references from Brad Smith, BSDs use getmntinfo as a system call for mounted filesystems. Most BSDs return statfs structures, (and we use OSX's statfs64), but NetBSD uses a statvfs structure. Simplify Linux getmntent_r to just use getmntent. AIX uses getmntent. An attempt at writing Solaris compatibility with a small bit of HPUX compatibility was made based on man page entries only. Fixes welcome. statvfs structures now use f_bsize for consistency with statfs Test case adjusted as PATH_MAX is OS defined (e.g. 1023 on AIX) Fixes: 0ee5cf83 also fixes: MDEV-27818: Disk plugin does not show zpool mounted devices This is because zpool mounted point don't begin with /. Due to the proliferation of multiple filesystem types since this was written, we restrict the entries listed in the disks plugin to excude: * read only mount points (no point monitoring, and includes squash, snaps, sysfs, procfs, cgroups...) * mount points that aren't directories (excludes /etc/hostname and similar mounts in containers). (getmntent (Linux/AIX) only) * exclude systems where there is no capacity listed (excludes various virtual filesystem types). Reviewer: Sergei Golubchik
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