connectionmanager: prevent JamiAccount usage

src/connectivity/connectionmanager.cpp

src/connectivity/connectionmanager.h

src/connectivity/security/diffie-hellman.cpp

src/connectivity/security/diffie-hellman.h

src/jamidht/jamiaccount.cpp

src/jamidht/jamiaccount.h

src/sip/sipvoiplink.cpp

test/unitTest/call/call.cpp