Update authors of the tests

Regression/bz1741076-usr-share-doc-json-c-is-present-in/main.fmf

@@ -2,6 +2,7 @@ summary: Test for BZ#1741076 (/usr/share/doc/json-c is present in)
 description: |
     Bug summary: /usr/share/doc/json-c is present in registry.access.redhat.com/ubi8-minimal
     Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=1741076
+author: Anna Khaitovich <akhaitov@redhat.com>
 contact: Frantisek Hrdina <fhrdina@redhat.com>
 component:
   - json-c

Regression/bz1806532-Do-not-use-enable-rdrand-when-building-json-c/main.fmf

@@ -2,6 +2,7 @@ summary: Test for BZ#1806532 (Do not use --enable-rdrand when building json-c)
 description: |
     Bug summary: Do not use --enable-rdrand when building json-c
     Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=1806532
+author: Ondrej Mejzlik <omejzlik@redhat.com>
 contact: Frantisek Hrdina <fhrdina@redhat.com>
 component:
   - json-c

Sanity/bz2001062-verify-versioned-symbols/main.fmf

@@ -1,5 +1,6 @@
 summary: verify that library contains versioned symbols
 description: ''
+author: Tomas Korbar <tkorbar@redhat.com>
 contact: Frantisek Hrdina <fhrdina@redhat.com>
 component:
   - json-c

Sanity/bz966964-json-c-upstream-tests/main.fmf

@@ -4,6 +4,7 @@ description: |
     Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=966964
 
     Runs upstream tests.
+author: Martin Zember <mzember@redhat.com>
 contact: Frantisek Hrdina <fhrdina@redhat.com>
 component:
   - json-c