style: change Process function calls to use camelCase

style: change Process function calls to use camelCase

The Process class methods were using an improper style and this subsequently
bled into the system call code.  The following regular expressions should be
helpful if someone transitions private system call patches on top of these
changesets:

s/alloc_fd/allocFD/
s/sim_fd(/simFD(/
s/sim_fd_obj/getFDEntry/
s/fix_file_offsets/fixFileOffsets/
s/find_file_offsets/findFileOffsets/