Add double tap sleep feature to secure lockscreens.

In its current state double tap works on the status bar on unsecure
lockscreens this adds the feature to pin, password, and pattern
lockscreens.

 - pin and password: double tap the text entry view.
 - pattern: double tap anywhere on the pattern view.

Patch Set 3:
 - add to slide lockscreen(glowpad): double tap glow pad to sleep
 - update commit message

Change-Id: I70eeae4acaa61b44feab661082bcfdbac7b9dfc3
Signed-off-by: baked <travp624@gmail.com>

Conflicts:
	packages/Keyguard/src/com/android/keyguard/KeyguardAbsKeyInputView.java
	packages/Keyguard/src/com/android/keyguard/KeyguardSelectorView.java
storage: Don't list removed volumes in storage list

 * Don't tell apps that USB storage or empty SD slots are available for
   use. This fixes errors about trying to create dirs in vold as well
   as the relevant CTS cases.

Change-Id: Ic763d40c19b0bb9f7497cc1515baf1661d76e9ee