tree df54674cf1f260bfe8a5458f34b5cf8cc450a6d9
parent 3538efb53bd6d3bfca91aa50db7a6e1b97b9c855
author Mehrdad Afshari <mmx@google.com> 1516225346 -0800
committer Mehrdad Afshari <mmx@google.com> 1516229359 -0800

Explicitly enable epoll on manylinux1

For some reason, the glibc version check does not enable
GRPC_LINUX_EPOLL on manylinux1. This commit:

* Explicitly enables GRPC_LINUX_LEGACY_EPOLL on MANYLINUX1
* Switches the flag to enable epoll1 IO manager to
  GRPC_LINUX_LEGACY_EPOLL instead of GRPC_LINUX_EPOLL.
  This is to ensure epollex and epollsig that are not yet
  compatible with epoll_create (not epoll_create1) do not
  get activated unintentionally.