sqlite3: Rename bbappend to match new oe-core version

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
libgcrypt: Rename bbappend to match new oe-core version

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
dropbear: Rename bbappend to match new oe-core version

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
dhcp: Rename bbappend to match new oe-core version

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
connman: Rename bbappend to match new oe-core version

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
README: update to depend on master branches