Require bash when we use bash syntax...
Require bash when we use bash syntax...

Change-Id: I25b82c1f04946f67f2835d448046f1daedae47fb
Reviewed-on: http://review.couchbase.org/12921
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Tested-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

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