provide global settings for APPIUM_APP_* properties

[vdelendik]

we can manage operations with local app storage and app downloading using extra parameters:

+        -e APPIUM_APP_SIZE_DISABLE=true \
+        -e APPIUM_APP_FETCH_RETRIES=2 \
+        -e APPIUM_MAX_LOCK_FILE_LIFETIME=180 \
+        -e APPIUM_APP_WAITING_TIMEOUT=90 \

let's put them into defaults/main.yml so they might be adjusted by admin much more easier

[vdelendik]

done for both linux and mac roles.
default values includes APPIUM_APP_SIZE_DISABLE not disabled, i.e.:

        -e APPIUM_APP_SIZE_DISABLE=false \
        -e APPIUM_APP_FETCH_RETRIES=2 \
        -e APPIUM_MAX_LOCK_FILE_LIFETIME=180 \
        -e APPIUM_APP_WAITING_TIMEOUT=90 \

[dhreben]

Verified.