MB-8241:  add "2.1.0r" tag at these revisions:

2a797a8d97f421587cce728f2e6aa2cd42c8fa26 - bucket_engine
b5b0402ec414e4f00fca6dcb1acaa89189091bdf - couchbase-cli
cd9c8600589a1996c1ba6dbea9ac171b937d3379 - couchbase-examples
f14c0f53b633b5313eca1ef64b0f241330cf02c4 - couchbase-python-client
db9f48e9e25bb04b7669d57ced4e66a237db33bc - couchdb
4b55af0e257909d917445b5b228e0a137f3cb889 - couchdbx-app
ee54a27968356a82d45a7dd7abd3e5bf739d1a45 - couchstore
02660cd89f63ec0e7da2e0b624d7f1157fe86c5c - ep-engine
02bea55b2075db97e539415cd9e999f60bf35fdf - geocouch
44a584d1de8c89addfb4f1d0522bdbbbed83ba48 - gperftools
3a8c895ce329d1b9e73944a8fd459ec3247ffdd1 - healthchecker
26359393672c378f41f2103a8699c4357c894be7 - icu4c
c0d3e26a51f25a2b020713559cb344d43ce0b06c - libconflate
ca739a890349ac36dc79447e37da7caa9ae819f5 - libmemcached
408057ec55da3862ab8d75b1ed25d2848afd640f - libvbucket
b6ceb46fc26ac6f1d6be7a5866d6c6c0f6e6d32a - memcached
4b391021af7a453bf88716724d2c644916ebd969 - moxi
307287cff275d8d62b7895599d1891582fdab1c9 - ns_server
53a532be23165d91259e8b1be5c13ad7fec075fa - portsigar
0ff6e32ea05037fddef1eb41a648f2a2141009ea - pysqlite
63a3cd1b316d2d4aa6dd31ce8fc66101b983e0b0 - sigar
5681dde156e9d07adbeeab79666c9a9d7a10ec95 - snappy
0c30a7ad3202049ed7b7d55d5811119d1f923ff0 - testrunner
cfca047718129f9ebc1af25ba8fc3e1fe7ad2943 - tlm
447decb75060a106131ab4de934bcc374648e7f2 - v8

Change-Id: I4f4e4776b2041c472d217aad2c69096b05f571c7