fixed json secret key export (now export the whole encrypted blob, since only that blob is being used to parse the key). added support to import json secret keys

tests/jsonunittests.cfg

@@ -35,6 +35,14 @@ include keys.cfg
     cmd = cat testkeyvjapub.json
     expect = /"Alicia"/
   </test>
+  <test check-json-export-secret>
+    cmd = $pcp -V vja -s -j -x a -O testkeyvjasec.json
+    expect-file testkeyvjasec.json
+  </test>
+  <test check-json-export-secret-isjson>
+    cmd = cat testkeyvjasec.json
+    expect = /"Alicia"/
+  </test>
 </test>
 
 <test vjb>
@@ -43,6 +51,21 @@ include keys.cfg
     cmd = $pcp -V vjb -K -I testkeyvjapub.json -j
     expect /added/
   </test>
+  <test check-json-import-public-open>
+    cmd = $pcp -V vjb -l
+    expect = /Alicia/
+  </test>
+</test>
+
+<test vjc>
+  <test check-json-import-secret>
+    cmd = $pcp -V vjc -K -I testkeyvjasec.json -x a -j
+    expect = /added/
+  </test>
+  <test check-json-import-secret-open>
+    cmd = $pcp -V vjc -l
+    expect = /Alicia/
+  </test>
 </test>
 
 <test vjtxt>