Updates from version 20.6
- Backport fixes:
- srp_daemon: Avoid extra permissions for the lock file
- srp_daemon: Fix the spelling of the name of two symbolic constants
- verbs: Make sure VM_DONTCOPY removed
- verbs: Close async_fd only when it was previously created
- libibverbs: Fix ABI_placeholder1 and ABI_placeholder2 assignment
- verbs: Fix ibv_create_wq() to set wq_context
- libibverbs: Fix description of ibv_get_device_guid man page
- buildlib: Fix a warning from newer pythons