Respect DISALLOW_DEBUGGING_FEATURES in IME shell commands

DISALLOW_DEBUGGING_FEATURES should restrict user's ability to call:
adb shell ime reset / set / enable / disable.

Fixes: 122922209
Test: Manually tested as follows:
     1. create a new user:
        adb shell pm create-user test
        output: Success: created user id 11
     2. Enable restriction:
        adb shell pm set-user-restriction --user 11 no_debugging_features 1
     3. Check default user has access with:
        adb shell ime reset
     4. Switch user to 11.
        adb shell am switch-user 11
     5. Try IME adb command for user 11
        adb shell ime reset
        output: User #11 is restricted with DISALLOW_DEBUGGING_FEATURES.
     6. Repeat for set, enable, disable.

Change-Id: I7714294a1bf7d0322c34e1d3bfba7f2e7fc8766e