Fix for arch specific netboot configuration

In a0635104d537ec539bf2fcf69f24f4f1c3ce3cd0, netboot configuration
routine, configure_all() was fixed to be called with the distro tree
arch and not the system supported archs.

Bug: 1165489
combine db migration 1c10e575800c into 3fc28d7eb6d3

... to avoid two sets of ALTER TABLE statements on the log_* tables.

Bug: 1163540
Change-Id: Ieec8014ab397206c649eef12271ecbdc4b2f2385
Fix for arch specific netboot configuration

In a0635104d537ec539bf2fcf69f24f4f1c3ce3cd0, netboot configuration
routine, configure_all() was fixed to be called with the distro tree
arch and not the system supported archs.

Bug: 1165489
Change-Id: I3d399485288b3e03fc9a1a1d67d37eb5fc761336
combine db migration 1c10e575800c into 3fc28d7eb6d3

... to avoid two sets of ALTER TABLE statements on the log_* tables.

Bug: 1163540
Change-Id: Ieec8014ab397206c649eef12271ecbdc4b2f2385
add ppc64le to the list of arches requiring PPC PReP Boot partition

Bug: 1162513
Change-Id: I65644150c160eb2b56346f39de4a45f4a8afeb94
beaker-wizard: strip EMBARGOED string from bug summaries

Based on a patch contributed by Martin Kyral <mkyral@redhat.com>.

Bug: 902299
Change-Id: I3090e7f4f3c50c373a20f6b7aaeaa69544ed86b3
beaker-init: handle existing admin user

Currently if you pass an existing username to beaker-init --user, it
will blow up. It's more useful to just update the existing account to be
an admin in that case.

Bug: 745560
Change-Id: I73f92aac55e6f1190cc60d95bef4bb71c592167a
new option --job-owner for workflow commands

Bug: 1014695
Change-Id: I1f44b184f93d9ab5ebc5576a93e4809572efbf7d
tweak wording for LC startup error messages

Bug: 1073266
Change-Id: Id27b4828c57ec0e97f29e8d58e21f8a60b286375
list possible permissions in bkr policy-grant/policy-revoke --help

Bug: 1009377
Change-Id: Ic2b48f6b87b1965656b790adf87eb49d1e36ca33
update release notes for 19.0 with some last minute bugs
Automatic commit of release 19.0
Merge tag 'beaker-19.0' into release-19
Merge branch 'release-19' into develop