Install script add topic names multiple times

[yatharthranjan]

In the connector properties, the install script adds the topic names multiple times if the values already exist. For example take a look at the sink-hdfs.properties file -

name=radar-hdfs-sink-android-15000
connector.class=io.confluent.connect.hdfs.HdfsSinkConnector
tasks.max=4
topics=android_biovotion_vsm1_acceleration,android_biovotion_vsm1_battery_level,android_biovotion_vsm1_blood_volume_pulse,android_biovotion_vsm1_energy,android_biovotion_vsm1_galvanic_skin_response,android_biovotion_vsm1_heartrate,android_biovotion_vsm1_heartrate_variability,android_biovotion_vsm1_led_current,android_biovotion_vsm1_oxygen_saturation,android_biovotion_vsm1_ppg_raw,android_biovotion_vsm1_respiration_rate,android_biovotion_vsm1_temperature,android_bittium_faros_acceleration,android_bittium_faros_acceleration,android_bittium_faros_battery_level,android_bittium_faros_ecg,android_bittium_faros_inter_beat_interval,android_empatica_e4_acceleration,android_empatica_e4_acceleration,android_empatica_e4_battery_level,android_empatica_e4_battery_level,android_empatica_e4_blood_volume_pulse,android_empatica_e4_blood_volume_pulse,android_empatica_e4_electrodermal_activity,android_empatica_e4_electrodermal_activity,android_empatica_e4_inter_beat_interval,android_empatica_e4_inter_beat_interval,android_empatica_e4_temperature,android_empatica_e4_temperature,android_local_weather,android_pebble_2_acceleration,android_pebble_2_battery_level,android_pebble_2_heartrate,android_pebble_2_heartrate_filtered,android_phone_acceleration,android_phone_acceleration,android_phone_battery_level,android_phone_battery_level,android_phone_bluetooth_devices,android_phone_bluetooth_devices,android_phone_call,android_phone_call,android_phone_contacts,android_phone_contacts,android_phone_gyroscope,android_phone_gyroscope,android_phone_light,android_phone_light,android_phone_magnetic_field,android_phone_magnetic_field,android_phone_relative_location,android_phone_relative_location,android_phone_sms,android_phone_sms,android_phone_sms_unread,android_phone_sms_unread,android_phone_step_count,android_phone_step_count,android_phone_usage_event,android_phone_usage_event,android_phone_user_interaction,android_phone_user_interaction,application_external_time,application_external_time,application_record_counts,application_record_counts,application_server_status,application_server_status,application_time_zone,application_uptime,application_uptime,notification_thinc_it,questionnaire_audio,questionnaire_esm,questionnaire_esm,questionnaire_esm,questionnaire_phq8,questionnaire_phq8,questionnaire_phq8,questionnaire_rses,questionnaire_rses,questionnaire_rses,task_2MW_test,task_romberg_test,task_tandem_walking_test,thincit_code_breaker,thincit_code_breaker,thincit_pdq5,thincit_pdq5,thincit_spotter,thincit_spotter,thincit_symbol_check,thincit_symbol_check,thincit_trails,thincit_trails,
flush.size=80000
rotate.interval.ms=900000
hdfs.url=hdfs://hdfs-namenode:8020
format.class=org.radarcns.sink.hdfs.AvroFormatRadar
topics.dir=topicAndroidNew