alpha_release-7-78-4

Commits since last release:

commit 30b2cd5 (HEAD -> refs/heads/alpha, tag: refs/tags/alpha_release-7-78-4, refs/remotes/origin/alpha)
Author: Timo Schroeder zack-vii@users.noreply.github.com
Date: Tue Jun 25 21:42:50 2019 +0200

Zck distributed connections (#1723)

* Fix: correctly check if c->state for other than CON_DISCONNECT

* Fix: attempt to manage connection via cleanup scheduler

* Fix: never reschedule disconnect

* Fix: previous after waiting for other task in disconnect

* Fix: Undef DEBUG and fix host_list_cleanup  logic

Removes DEBUG printout.
Changes host_list_cleanup execution to run only when the timeout expires. Previously it
was executed immediately after each time the host_list_sig is signaled. Also errno is not
set to ETIMEDOUT when pthread_cond_timedwait times out. Instead the call returns
ETIMEDOUT. At least on fc28 where I tested this.

* Fix: Typo

commit 3385cb4
Author: Schroeder, Timo (cloud) timo.schroeder@ipp.mpg.de
Date: Tue Jun 25 15:45:33 2019 +0200

Fix: uniform thread and tunnel implementation

commit 0d4f2e3
Author: twf twf@psfc.mit.edu
Date: Tue Jun 25 08:58:22 2019 -0400

Fix: More fixes to installers

commit ed3686b
Author: Josh Stillerman jas@psfc.mit.edu
Date: Tue Jun 25 09:19:50 2019 -0400

Fix: TCL do/method with args segfault

The call to process the arguments in TclDoMethod was passing the
address of a descriptor to TdiIntrisic.  It needed to pass the address
of this pointer because the input argument is declared:
```
struct descriptor *list[]
```