MB-5646: cbcollect_info fixes, including cbstats raw allocator
MB-5646: cbcollect_info fixes, including cbstats raw allocator

Besides adding 'cbstats raw allocator', cbstats might not also accept
'-a' flag anymore, so we call it twice, with and without, just in
case.

Additionally, fixed trying to get the dbdir on linux.

Change-Id: Icdf657425b82f2e78ee270c26c2f6689532f9002
Reviewed-on: http://review.couchbase.org/17523
Reviewed-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

mschoch/ns_server,ceejatec/ns_server,membase/ns_server,nimishzynga/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,daverigby/ns_server,mschoch/ns_server,nimishzynga/ns_server,pavel-blagodov/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,pavel-blagodov/ns_server,vzasade/ns_server,ceejatec/ns_server,daverigby/ns_server,ceejatec/ns_server,vzasade/ns_server,membase/ns_server,membase/ns_server,t3rm1n4l/ns_server,pavel-blagodov/ns_server,mschoch/ns_server,vzasade/ns_server,t3rm1n4l/ns_server,membase/ns_server,daverigby/ns_server,membase/ns_server,mschoch/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,membase/ns_server,pavel-blagodov/ns_server,daverigby/ns_server,ceejatec/ns_server,nimishzynga/ns_server,mschoch/ns_server,vzasade/ns_server,ceejatec/ns_server,nimishzynga/ns_server,nimishzynga/ns_server