tests: Add torture_pki_write_privkey_ecdsa test.
tests: Add torture_pki_write_privkey_ecdsa test.

sebadoom/libssh,robxu9/libssh,sebadoom/libssh,robxu9/libssh,Distrotech/libssh,sebadoom/libssh,taikoo/libssh,sebadoom/libssh,DouglasHeriot/libssh,elastichosts/libssh,nviennot/libssh,Distrotech/libssh,taikoo/libssh,wangshawn/libssh,mwgoldsmith/ssh,nviennot/libssh,mwgoldsmith/ssh,mwgoldsmith/libssh,DouglasHeriot/libssh,kedazo/libssh,mwgoldsmith/libssh,kedazo/libssh,taikoo/libssh,Distrotech/libssh,wangshawn/libssh,pouete/libssh,kedazo/libssh,mwgoldsmith/libssh,mwgoldsmith/ssh,pouete/libssh,nviennot/libssh,kedazo/libssh,elastichosts/libssh,mwgoldsmith/libssh,DouglasHeriot/libssh,robxu9/libssh,wangshawn/libssh,elastichosts/libssh,pouete/libssh,DouglasHeriot/libssh,pouete/libssh,robxu9/libssh,wangshawn/libssh,taikoo/libssh,mwgoldsmith/ssh,nviennot/libssh,Distrotech/libssh