pdnsutil: check for key presence after import

[miodvallat]

Short description

This applies the same "fetch key after add" verification logic, added to pdnsutil add-zone-key command recently, to the import-zone-key and import-zone-key-pem commands.

Checklist

I have:

• read the CONTRIBUTING.md document although not recently
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code (somehow)
• added or modified regression test(s)
• added or modified unit test(s)

[coveralls]

Pull Request Test Coverage Report for Build 12927476221

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 29 unchanged lines in 10 files lost coverage.
• Overall coverage increased (+0.005%) to 64.706%

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Files with Coverage Reduction	New Missed Lines	%
pdns/misc.cc	1	63.04%
ext/json11/json11.cpp	1	64.49%
pdns/backends/gsql/gsqlbackend.hh	1	97.71%
pdns/dnsdistdist/dnsdist-crypto.cc	2	75.72%
pdns/recursordist/aggressive_nsec.cc	2	66.02%
pdns/recursordist/test-syncres_cc2.cc	3	88.85%
pdns/recursordist/rec-main.cc	3	62.41%
pdns/recursordist/syncres.cc	4	80.02%
pdns/packethandler.cc	6	73.05%
pdns/dnsdistdist/dnsdist-carbon.cc	6	61.6%

Totals
Change from base Build 12927190209:	0.005%
Covered Lines:	127850
Relevant Lines:	166477

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💛 - Coveralls