conf: add options for librados timeouts

These will be implemented in subsequent patches.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
(cherry picked from commit 0dcceff1378d85ca6d81d102d201890b8a71af6b)
librados: add timeout to wait_for_osdmap()

This is used by several pool operations independent of the objecter,
including rados_ioctx_create() to look up the pool id in the first
osdmap.

Unfortunately we can't just rely on WaitInterval returning ETIMEDOUT,
since it may also get interrupted by a signal, so we can't avoid
keeping track of time explicitly here.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
(cherry picked from commit 1829d2c9fd13f2cbae4e192c9feb553047dad42c)

Conflicts:
	src/librados/RadosClient.cc
Objecter: implement mon and osd operation timeouts

This captures almost all operations from librados other than mon_commands().

Get the values for the timeouts from the Objecter constructor, so only
librados uses them.

Add C_Cancel_*_Op, finish_*_op(), and *_op_cancel() for each type of
operation, to mirror those for Op. Create a callback and schedule it
in the existing timer thread if the timeouts are specified.

Fixes: #6507
Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
(cherry picked from commit 3e1f7bbb4217d322f4e0ece16e676cd30ee42a20)

Conflicts:
	src/osd/ReplicatedPG.cc
MonClient: add a timeout on commands for librados

Just use the conf option directly, since librados is the only caller.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
(cherry picked from commit 671a76d64bc50e4f15f4c2804d99887e22dcdb69)
msg/Pipe: add option to restrict delay injection to specific msg type

This makes it possible to test timeouts reliably by delaying certain
messages effectively forever, but still being able to e.g. connect and
authenticate to the monitors.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
(cherry picked from commit d389e617c1019e44848330bf9570138ac7b0e5d4)
librados: check and return on error so timeouts work

Some functions could not previously return errors, but they had an
int return value, which can now receive ETIMEDOUT.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
(cherry picked from commit 8e9459e897b1bc2f97d52ee07701fd22069efcf3)
rados: check return values for commands that can now fail

A few places were not checking the return values of commands, since
they could not fail before timeouts were added.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
(cherry picked from commit 79c1874346ff55e2dc74ef860db16ce70242fd00)
qa: add script for testing rados client timeout options

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
(cherry picked from commit 9e62beb80b6c92a97ec36c0db5ea39e417661b35)