CI: Try to fix coverity setup

.travis-coverity-scan.py

@@ -29,3 +29,4 @@ with open('.travis.yml', 'w') as f:
 subprocess.check_call(['git checkout -b coverity_scan'], shell=True)
 subprocess.check_call(['git commit .travis.yml -m"Automatic coverity scan for {}"'.format(datetime.date.today())], shell=True)
 subprocess.check_call(['git push coverity coverity_scan -f'], shell=True)
+subprocess.call(['git push coverity master'], shell=True)

.travis-coverity.yml

@@ -11,11 +11,11 @@ addons:
       name: "znc/coverity"
       description: "Build submitted via Travis CI"
     notification_email: coverity@znc.in
-    build_command_prepend: "./bootstrap.sh; ./configure --enable-perl --enable-python --enable-tcl --enable-cyrus"
+    build_command_prepend: "./configure --enable-perl --enable-python --enable-tcl --enable-cyrus"
     build_command: "make VERBOSE=1"
     branch_pattern: coverity_scan
 
 script:
   - /bin/true
 sudo: required
-dist: trusty
+dist: bionic