remove memcached and redis modules from source tree

Source was kept for historical reasons but was not in use since 2.0.0.
It is now clear that there are better approaches to implement
distributed cache so it is pointless to keep old stuff in tree and
confuse users.
25 jobs for <span class="ref-name">remove_memcached_redis</span> in 6 minutes and 22 seconds (queued for 7 seconds)
Status Job ID Name Coverage
  Build
passed #165121
docker linux amd64
build:clang:linux:amd64

00:00:43

passed #165120
docker linux amd64
build:linux:amd64

00:00:45

passed #165122
docker linux amd64 allowed to fail
srpm

00:00:25

 
  Test
passed #165203
docker linux amd64
deckard:linux:amd64

00:01:12

failed #165136
privileged
distro:epel-7

00:02:32

failed #165135
privileged
distro:fedora-27

00:02:58

passed #165128
docker
doc

00:00:51

passed #165127
docker linux amd64
installcheck:linux:amd64

00:01:09

passed #165130
docker linux amd64
installcheck:valgrind:linux:amd64

00:01:40

passed #165124
docker
lint:c

00:02:40

failed #165125
docker allowed to fail
lint:clang-scan-build

00:01:19

passed #165123
docker
lint:lua

00:00:40

passed #165133
docker linux amd64
respdiff:iter:tcp:linux:amd64

00:04:17

passed #165134
docker linux amd64
respdiff:iter:tls:linux:amd64

00:04:23

passed #165132
docker linux amd64
respdiff:iter:udp:linux:amd64

00:04:11

passed #165126
docker linux amd64
test:linux:amd64

00:01:09

passed #165131
docker linux amd64
test:linux:amd64:valgrind

00:01:10

failed #165129
docker linux amd64
deckard:linux:amd64

00:01:15

 
  Respdiff
skipped #165137
respdiff
respdiff:fwd-tls6-kresd.udp6
skipped #165138
respdiff
respdiff:fwd-udp6-kresd.udp6
skipped #165142
respdiff
respdiff:fwd-udp6-unbound.tcp6
skipped #165143
respdiff
respdiff:fwd-udp6-unbound.tls6
skipped #165141
respdiff
respdiff:fwd-udp6-unbound.udp6
skipped #165140
respdiff allowed to fail
respdiff:iter.tls6
skipped #165139
respdiff
respdiff:iter.udp6
 
Name Stage Failure
failed
distro:fedora-27 Test
ERROR: Command failed: 
# bash --login -c /usr/bin/rpmbuild -bb --target x86_64 --nodeps /builddir/build/SPECS/knot-resolver.spec

Running after script...
$ mv /var/lib/mock/fedora-27-x86_64/result fedora-27-x86_64
Uploading artifacts...
fedora-27-x86_64/: found 6 matching files
Uploading artifacts to coordinator... ok id=165135 responseStatus=201 Created token=yMeC9jQu
ERROR: Job failed: exit code 1
failed
distro:epel-7 Test
mockbuild.exception.Error: Command failed: 
# bash --login -c /usr/bin/rpmbuild -bb --target x86_64 --nodeps /builddir/build/SPECS/knot-resolver.spec

Running after script...
$ mv /var/lib/mock/epel-7-x86_64/result epel-7-x86_64
Uploading artifacts...
epel-7-x86_64/: found 6 matching files
Uploading artifacts to coordinator... ok id=165136 responseStatus=201 Created token=cmWfXCDd
ERROR: Job failed: exit code 1
failed
lint:clang-scan-build Test
                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 warnings generated.
CCLD daemon/kresd
scan-build: 32 bugs found.
scan-build: Run 'scan-view /builds/knot/knot-resolver/scan-results/2018-08-17-125845-14-1' to examine bug reports.
Uploading artifacts...
scan-results: found 37 matching files
Uploading artifacts to coordinator... ok id=165125 responseStatus=201 Created token=k8oZnHCs
ERROR: Job failed: exit code 1