Fix for non DTR, RTS bluetooth radios

Currently connection via DTR, RTS disabled BT modules is almost
impossible. This is happening due to resetting DTR line which makes the
connection impossible on some modules.

To use this fix please also add following line to your config.xml:
<CHK_resetapmonconnect>false</CHK_resetapmonconnect>
Merge pull request #509 from FenomPL/master

Fix for non DTR, RTS bluetooth radios