wireless-hostapd: ensure the cipher value given is used by hostapd

When configuring the wireless interface to use WPA, setting the ciper
value has no effect on the hostapd configuration file generated,
resulting in wpa_pairwise always being assigned the default values.

The fix enables setting this value in the generated hostapd file.
wireless-hostapd: set the default cipers to CCMP TKIP

Some broken clients accept the first ciper offered to them, using TKIP
rather than CCMP even when they are capable of.  Swapping the default
ciphers results in CCMP being offered to these clients first.  The
behaviour can be return to the previous defaults by simply setting the
ciphers in configuration mode.