v15-rc1: rdma-core-15-rc1

Updates from rdma-core version 14:

- Add flow steering drop action
- mmio_flush_write fixes
- Fixes for uclibc
- Add common mmio accessor routines and remove per provider mmio
  routines
- qedr fixes
- Lots of fixes for debian packaging
- Copyright fixes
- Properly conflict with infiniband-diags
- Add direct verbs support to mlx4 provider
- Improvement to Travis CI checking
- Enforce kernel coding style in rdma-core
- Add initial verbs hotplug support
- Sparse annotations
- Systemd updates for srp_daemon and iwpmd
- Red Hat packaging fixes
- Properly make the entire rdma-core support udev hotplug activation
- Packaging fixes related to the joining of packages and globs that are
  no longer valid