is-cpu-isolated.sh: use getopts for argument parsing

Currently argument list has to be passed in a specific order for it to work.
This isn't scalable as argument list grows. Lets parse arguments with getopts
instead to scale better.

New command format to test isolation.

./is-cpu-isolated.sh -hv -c <comma separated cpulist> -t <task_name> -f
<isolation_func_type> -s <sample count> -d <min isol duration>

By default <cpu=cpu1>, <task=stress>, <func_type=all>, <sample_count=1> and
<min isol duration =10>

Possible function types (-f)
   1. isolate :  Isolate core(s) for task
   2. duration : Application isolation duration
   3. clear   :  Clear cpuset rules used for step1
   4. nonisol_list : Update list of all nonisol cpus
   5. all     :  do step1,2,3

Examples :
1) run odp_isolation application on cpu no 1 and 2, function
type <isolation>
./is-cpu-isolated.sh -c 1,2 -t odp_isolation -f isolate

2) Get step1 isolate <duration>
./is-cpu-isolated.sh -c 1,2 -t odp_isolation -f duration

3) <clear> cpuset for step1
./is-cpu-isolated.sh -c 1,2 -t odp_isolation -f clear

4) "-f all" == do step1),2),3)
./is-cpu-isolated.sh -c 1,2 -t odp_isolation -f all

5)  Update list of all nonisol cpus
./is-cpu-isolated.sh -c 1,2 -t odp_isolation -f nonisol_list

6) Running with no argument execute default
./is-cpu-isolated.sh

From now onwards is-cpu-isolated.sh script will run other isolation application
unlike default stress application.

Signed-off-by: Santosh Shukla <santosh.shukla@linaro.org>

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