dnssec-coverage: fix handling of zones without trailing dots

After change 5143, zones listed on the command line without trailing
dots were ignored.
39 jobs for !1478 with u/fanf2/dnssec-coverage-dots in 43 minutes and 14 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Precheck
passed #171306
amd64 linux
🐞:sid:amd64

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passed #171305
amd64 linux
misc:sid:amd64

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  Build
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amd64 linux
asan:sid:amd64

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amd64 linux
clang:stretch:amd64

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i386 linux
clang:stretch:i386

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passed #171307
amd64 linux
docs:sid:amd64

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amd64 linux
gcc:bionic:amd64

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passed #171308
amd64 linux
gcc:centos6:amd64

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passed #171309
amd64 linux
gcc:centos7:amd64

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passed #171314
amd64 linux
gcc:fedora29:amd64

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passed #171310
amd64 linux
gcc:jessie:amd64

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passed #171312
amd64 linux
gcc:sid:amd64

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passed #171313
i386 linux
gcc:sid:i386

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passed #171311
amd64 linux
gcc:stretch:amd64

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passed #171315
amd64 linux
gcc:xenial:amd64

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passed #171320
amd64 linux
pkcs11:sid:amd64

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  Test
passed #171339
amd64 linux
system:asan:sid:amd64

00:39:03

passed #171337
amd64 linux
system:gcc:bionic:amd64

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passed #171321
amd64 linux
system:gcc:centos6:amd64

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passed #171323
amd64 linux
system:gcc:centos7:amd64

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passed #171333
amd64 linux
system:gcc:fedora29:amd64

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passed #171325
amd64 linux
system:gcc:jessie:amd64

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passed #171329
amd64 linux
system:gcc:sid:amd64

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passed #171331
i386 linux
system:gcc:sid:i386

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passed #171327
amd64 linux
system:gcc:stretch:amd64

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passed #171335
amd64 linux
system:gcc:xenial:amd64

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passed #171342
amd64 linux
system:pkcs11:sid:amd64

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passed #171340
amd64 linux
unit:asan:sid:amd64

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passed #171341
amd64 linux
unit:clang:stretch:amd64

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passed #171338
amd64 linux
unit:gcc:bionic:amd64

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passed #171322
amd64 linux
unit:gcc:centos6:amd64

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passed #171324
amd64 linux
unit:gcc:centos7:amd64

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passed #171334
amd64 linux
unit:gcc:fedora29:amd64

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amd64 linux
unit:gcc:jessie:amd64

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amd64 linux
unit:gcc:sid:amd64

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passed #171332
i386 linux
unit:gcc:sid:i386

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passed #171328
amd64 linux
unit:gcc:stretch:amd64

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passed #171336
amd64 linux
unit:gcc:xenial:amd64

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passed #171343
amd64 linux
unit:pkcs11:sid:amd64

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