examples: Updated python gpio isr example
examples: Updated python gpio isr example

Example now takes pin number from command line and displays gpio level
when it changes.

Signed-off-by: Henry Bruce <57ea958cad66de244404958c9a01f7a4ad51b29e@intel.com>
Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

ncrastanaren/mraa,intel-iot-devkit/mraa,g-vidal/mraa,alext-mkrs/mraa,ProfFan/mraa,ProfFan/mraa,alext-mkrs/mraa,andreivasiliu2211/mraa,stefan-andritoiu/mraa-gpio-chardev,arunlee77/mraa,KurtE/mraa,yongli3/mraa,arfoll/mraa,alext-mkrs/mraa,jontrulson/mraa,Propanu/mraa,sergev/mraa,arunlee77/mraa,stefan-andritoiu/mraa,yongli3/mraa,ProfFan/mraa,intel-iot-devkit/mraa,g-vidal/mraa,w4ilun/mraa,jontrulson/mraa,KurtE/mraa,g-vidal/mraa,intel-iot-devkit/mraa,ncrastanaren/mraa,ncrastanaren/mraa,petreeftime/mraa,spitfire88/mraa,malikabhi05/mraa,andreivasiliu2211/mraa,KurtE/mraa,arunlee77/mraa,ncrastanaren/mraa,stefan-andritoiu/mraa-gpio-chardev,arfoll/mraa,malikabhi05/mraa,g-vidal/mraa,Propanu/mraa,alext-mkrs/mraa,intel-iot-devkit/mraa,spitfire88/mraa,malikabhi05/mraa,whbruce/mraa,stefan-andritoiu/mraa,malikabhi05/mraa,stefan-andritoiu/mraa-gpio-chardev,arfoll/mraa,andreivasiliu2211/mraa,jontrulson/mraa,w4ilun/mraa,petreeftime/mraa,Jon-ICS/mraa,stefan-andritoiu/mraa,w4ilun/mraa,Hbrinj/mraa,spitfire88/mraa,Hbrinj/mraa,Hbrinj/mraa,whbruce/mraa,yongli3/mraa,andreivasiliu2211/mraa,petreeftime/mraa,w4ilun/mraa,sergev/mraa,sergev/mraa,yongli3/mraa,intel-iot-devkit/mraa,sergev/mraa,arfoll/mraa,arfoll/mraa,yongli3/mraa,g-vidal/mraa,stefan-andritoiu/mraa,KurtE/mraa,malikabhi05/mraa,jontrulson/mraa,Hbrinj/mraa,alext-mkrs/mraa,stefan-andritoiu/mraa-gpio-chardev,jontrulson/mraa,Pillar1989/mraa,Jon-ICS/mraa,ProfFan/mraa,arunlee77/mraa,whbruce/mraa,Propanu/mraa,spitfire88/mraa,stefan-andritoiu/mraa,sergev/mraa,ncrastanaren/mraa,Propanu/mraa,Propanu/mraa,Pillar1989/mraa,petreeftime/mraa,Jon-ICS/mraa,KurtE/mraa,whbruce/mraa,Pillar1989/mraa,stefan-andritoiu/mraa-gpio-chardev