Slave removal: config.c converted + config rewriting hacks.
Slave removal: config.c converted + config rewriting hacks.

Aliases added for all the commands mentioning slave. Moreover CONFIG
REWRITE will use the new names, and will be able to reuse the old lines
mentioning the old options.

soveran/redis,antirez/redis,neomantra/redis,spinlock/redis,pmem/redis,neomantra/redis,pmem/redis,PKRoma/redis,ofirluzon/redis,antirez/redis,PKRoma/redis,soveran/redis,pmem/redis,PKRoma/redis,ctripcorp/redis,yossigo/redis,spinlock/redis,charsyam/redis,oranagra/redis,charsyam/redis,spinlock/redis,yossigo/redis,charsyam/redis,neomantra/redis,oranagra/redis,ctripcorp/redis,nnog/redis,yossigo/redis,soloestoy/redis,PKRoma/redis,oranagra/redis,charsyam/redis,soveran/redis,oranagra/redis,antirez/redis,neomantra/redis,ofirluzon/redis,charsyam/redis,nnog/redis,yossigo/redis,soveran/redis,antirez/redis,ctripcorp/redis,oranagra/redis,PKRoma/redis,ofirluzon/redis,ofirluzon/redis,soloestoy/redis,ctripcorp/redis,nnog/redis,soloestoy/redis,spinlock/redis,ofirluzon/redis,pmem/redis,yossigo/redis,nnog/redis,soloestoy/redis,soloestoy/redis,neomantra/redis