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A significant amount of code was dedicated to maintaining backward
compatibility with OpenSSL. However, compatibility will no longer be
maintained for several reasons:

 * BoringSSL does not have ENGINE functionality and testing it is
   difficult because another version must be compiled against OpenSSL.
   Moreover, AndroidKeyStore Provider has taken over keystore
   functionality since M release resulting in dead code.

 * Secure defaults such as deterministic EC signatures are part of
   BoringSSL so extra JNI calls do not need to be made for them.

 * A not insignificant number of lines of code were dedicated to
   maintaining compatibility with OpenSSL resulting in empty JNI
   functions. Removing these functions results in a speed-up because
   there will be fewer JNI transitions to call these useless functions
   when using BoringSSL.

Since AndroidKeyStore functionality has been moved, this change also
removes all references to keystore functionality even for BoringSSL
(i.e., EVP_PKEY_from_keystore).

Test:
    vogar --mode host
    libcore/luni/src/test/java/libcore/java/security/*Test.java
    libcore/luni/src/test/java/libcore/javax/crypto/*Test.java
    libcore/luni/src/test/java/libcore/javax/net/ssl/*Test.javIa

Change-Id: I304e0f2c882c313753b0e9327c6293385fd6794b