Delay SSLSocketImpl instantiation until needed DO NOT MERGE

Class preloading will create an instance of objects if they are in
static fields, so put the ones we don't want instantiated into a holder
class that is not preloaded.

(cherry picked from commit da5b7116b58795b169961cbd63c2b21bac741d9a)

Bug: 9984058
Change-Id: Ifbf7b7a3668f19ca21fa66a486ae557086a195b5
Do not apply the PRNG workarounds if an explicit seed is given

If the caller seeds the engine, do NOT override that seed with another
from urandom.

This is a companion change to Ib6bf4478fc1ae3d16eefa4eb2ad90f1f3e9de021,
and should be reverted along with it when the proper fix appears.

Change-Id: I0a9ba35d74af89c91b6aafa35cc94001372794e1
Merge tag 'android-4.3_r3.1' of https://android.googlesource.com/platform/libcore into cm-10.2

Android 4.3 Release 3.1