adb: Use 64 bit capabilities.

Fix the following kernel warning:

$ adb shell dmesg | grep adb
<6>[    7.813003] warning: `adbd' uses 32-bit capabilities (legacy support in use)

Change-Id: I3912302c5c577f1cb03f0c591834ab7b3a72ddf5
Tidy up long lines

Change-Id: I22d90a343c351b90f460b8810bfb4bd28dc0792d
libsysutils: Increase command buffersize and command args

Needed to support tethering of multiple remote Bluetooth devices.

Change-Id: I9f736affd83226e8b2fa4f0faacd3654175dd8c9
Signed-off-by: Patrik Ryd <patrik.ryd@stericsson.com>