booster: Integrate VMP-based mounting

This commit brings into booster the use of VMP based operations
which will allow users of booster to specifiy a VMP and use it
for transparently operating on a glusterfs client context.

Since applications are oblivious to booster's presence, because it is
LD_PRELOAD'ed, we need to specify the VMPs and the corresponding
options like volfile, logfile, loglevel, through a conf file.

By default, this conf file is the /etc/booster.conf. This can be
over-ridden through the GLFS_BOOSTER_CONF environment variable
for the application.

The format of the conf file is very simple for now. Each VMP is
described on a single line with space separated fields.

Format: <Virtual Mount Point> <volfile-path> <log-file> <log-level>

<log-level> takes the string representation of the usual glusterfs
log levels.

Signed-off-by: Anand V. Avati <avati@amp.gluster.com>

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