Do not initialize SSLSocketFactory too early DO NOT MERGE

During Zygote initialization, the class may be preloaded. However we do
not want the default instances of SSLSocketFactory initialized, so move
those into a holder class so they are only initialized when used.

(cherry picked from commit 72017834153711733905dfcf4bfe7b802062692b)

Bug: 9984058
Change-Id: I245d3d075c8c3476e9f76579ef7141e447f92011
Merge tag android-4.3.1_r1 into dev-mips-jb-mr2