tests: Relax receive_SUITE time constraint
tests: Refactor away ?line macro
tests: Relax system_profile_SUITE scheduler test
snmp: Silence debug in tests
os_mon: Relax disksup_SUITE api test
os_mon: Refactor disksup_SUITE

Notably, remove ?line macro.
os_mon: Fix freebsd diskspace queries

Use 'df -k -l' to query FreeBSD about diskspace on local disks.
Previously 'df' -k -t ufs' was used but this will not handle zfs
disks. Just use '-l' instead of listing potential filesystems.
os_mon: Fix openbsd diskspace queries

Use 'df -k -l' to query OpenBSD about diskspace on local disks.
Same reasoning as for FreeBSD - additional filesystems without
listing them all.
os_mon: Relax disksup_SUITE test even more

Capacity can be zero on certain filesystems.
Remove reported mountpoints with zero capacity during tests since
these reports false positives.
Merge branch 'egil/test-cuddling' into maint
Merge branch 'egil/os_mon/fix-bsd-disksup/OTP-11207' into maint

* egil/os_mon/fix-bsd-disksup/OTP-11207:
  os_mon: Fix openbsd diskspace queries
  os_mon: Fix freebsd diskspace queries